NRP Natural Resource Partners Ltd New

Less: income attributable to preferred unitholders

38,595

^[1]

63,846

^[2]

140,872

213,455

(655)

(2,936)

(4,248)

(14,568)

Less: redemption of preferred units

(10,819)

(17,083)

(24,485)

(60,929)

Net income attributable to common unitholders and the general partner

27,121

43,827

112,139

137,958

Net income attributable to common unitholders

26,578

42,951

109,896

135,199

Net income attributable to the general partner

$ 543

$ 876

$ 2,243

$ 2,759

Net income per common unit (see Note 5)

Basic (in dollars per share)

$ 2.04

$ 3.4

$ 8.47

$ 10.72

Diluted (in dollars per share)

$ 2

$ 2.91

$ 8.21

$ 8.88

Comprehensive income (loss) from unconsolidated investment and other

$ 38,595

^[1]

$ 63,846

^[2]

$ 140,872

$ 213,455

2,200

2,166

(16,472)

Comprehensive income

38,677

66,046

143,038

196,983

Royalty and Other Mineral Rights [Member] | Mineral Rights Segment [Member]

Revenues and other income

Revenues

50,405

68,533

172,368

205,811

Transportation and Processing Services [Member] | Mineral Rights Segment [Member]

Revenues and other income

Revenues

$ 1,812

$ 4,579

$ 7,900

$ 11,447

[1]	Net income includes $0.66 million of income attributable to preferred unitholders that accumulated during the period, of which $0.64 million is allocated to the common unitholders and $0.01 million is allocated to the general partner.
[2]	Net income includes $2.9 million of income attributable to preferred unitholders that accumulated during the period, of which $2.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.

Consolidated Statements of Partners' Capital (Unaudited) - USD ($)
$ in Thousands

Total

AOCI Attributable to Parent [Member]

Limited Partner [Member]

General Partner [Member]

Warrant Holder [Member]

Balance (in shares) at Dec. 31, 2022

12,506,000

Balance at Dec. 31, 2022

$ 477,457

$ 18,717

$ 404,799

$ 5,977

$ 47,964

Distributions to common unitholders and the general partner

^[1]

79,275

77,690

1,585

(40,900)

(40,082)

(818)

Issuance of unit-based awards (in shares)

(8,086)

$ (7,924)

(162)

129,000

Comprehensive income from unconsolidated investment and other

(1,178)

$ (1,178)

Capital contribution

142

(19,583)

Balance (in shares) at Mar. 31, 2023

(16,228)

$ (15,904)

(324)

12,635,000

Balance at Mar. 31, 2023

470,899

(866)

$ 417,401

6,400

47,964

Balance (in shares) at Dec. 31, 2022

12,506,000

Balance at Dec. 31, 2022

477,457

18,717

$ 404,799

5,977

47,964

Comprehensive income from unconsolidated investment and other

213,455

(16,472)

Balance (in shares) at Sep. 30, 2023

12,635,000

Balance at Sep. 30, 2023

503,327

2,245

$ 461,043

7,196

32,843

Balance (in shares) at Mar. 31, 2023

12,635,000

Balance at Mar. 31, 2023

470,899

(866)

$ 417,401

6,400

47,964

Distributions to common unitholders and the general partner

^[2]

70,334

68,927

1,407

(9,669)

(9,476)

(193)

(7,396)

(7,248)

(148)

Comprehensive income from unconsolidated investment and other

2,299

911

Balance (in shares) at Jun. 30, 2023

(27,618)

$ (27,065)

(553)

12,635,000

Balance at Jun. 30, 2023

499,760

$ 444,838

6,913

47,964

Distributions to common unitholders and the general partner

^[3]

63,846

62,569

1,277

(9,669)

(9,475)

(194)

(4,437)

(4,349)

(88)

Comprehensive income from unconsolidated investment and other

2,318

Warrant settlements

(33,608)

(18,117)

(370)

(15,121)

2,200

Balance (in shares) at Sep. 30, 2023

(17,083)

$ (16,741)

(342)

12,635,000

Balance at Sep. 30, 2023

503,327

2,245

$ 461,043

7,196

32,843

Balance (in shares) at Dec. 31, 2023

12,635

Balance at Dec. 31, 2023

531,054

(3,122)

$ 503,076

8,005

23,095

Distributions to common unitholders and the general partner

^[4]

56,213

55,089

1,124

(42,186)

(41,342)

(844)

Issuance of unit-based awards (in shares)

(2,150)

$ (2,107)

(43)

126

Issuance of unit-based awards

$ 0

Warrant settlements (in shares)

(3,971)

Capital contribution

227

$ 0

227

199

Warrant settlements

(55,689)

$ (36,650)

(748)

(18,291)

Comprehensive income from unconsolidated investment and other

845

$ 0

Balance (in shares) at Mar. 31, 2024

12,960

Balance at Mar. 31, 2024

484,343

(2,277)

$ 474,095

7,721

4,804

Balance (in shares) at Dec. 31, 2023

12,635

Balance at Dec. 31, 2023

531,054

(3,122)

$ 503,076

8,005

23,095

Comprehensive income from unconsolidated investment and other

140,872

2,166

Balance (in shares) at Sep. 30, 2024

13,049

Balance at Sep. 30, 2024

517,193

(956)

$ 509,258

8,891

Balance (in shares) at Mar. 31, 2024

12,960

Balance at Mar. 31, 2024

484,343

(2,277)

$ 474,095

7,721

4,804

Distributions to common unitholders and the general partner

^[5]

46,064

45,142

922

(9,987)

(9,787)

(200)

(2,643)

(2,590)

(53)

Warrant settlements (in shares)

2,502

Capital contribution

555

$ 0

555

Warrant settlements

(10,000)

$ (5,092)

(104)

(4,804)

Comprehensive income from unconsolidated investment and other

1,239

Balance (in shares) at Jun. 30, 2024

(13,666)

$ (13,393)

(273)

13,049

Balance at Jun. 30, 2024

498,407

(1,038)

$ 490,877

8,568

Distributions to common unitholders and the general partner

^[6]

38,595

37,824

771

(9,986)

(9,787)

(199)

(1,605)

(1,573)

(32)

Comprehensive income from unconsolidated investment and other

2,519

Balance (in shares) at Sep. 30, 2024

(10,819)

$ (10,602)

(217)

13,049

Balance at Sep. 30, 2024

$ 517,193

$ (956)

$ 509,258

$ 8,891

$ 0

[1]	Net income includes $6.7 million of income attributable to preferred unitholders that accumulated during the period, of which $6.5 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[2]	Net income includes $5.0 million of income attributable to preferred unitholders that accumulated during the period, of which $4.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[3]	Net income includes $2.9 million of income attributable to preferred unitholders that accumulated during the period, of which $2.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[4]	Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.
[5]	Net income includes $1.44 million of income attributable to preferred unitholders that accumulated during the period, of which $1.41 million is allocated to the common unitholders and $0.03 million is allocated to the general partner.
[6]	Net income includes $0.66 million of income attributable to preferred unitholders that accumulated during the period, of which $0.64 million is allocated to the common unitholders and $0.01 million is allocated to the general partner.

Consolidated Statements of Partners' Capital (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Allocation to unitholders	$ 655	$ 1,440	$ 2,150	$ 2,936	$ 4,970	$ 6,660
Allocation to unitholders	655	1,440	2,150	2,936	4,970	6,660
Limited Partner [Member]
Allocation to unitholders	640	1,410	2,110	2,880	4,870	6,530
Allocation to unitholders	640	1,410	2,110	2,880	4,870	6,530
General Partner [Member]
Allocation to unitholders	10	30	40	60	100	130
Allocation to unitholders	$ 10	$ 30	$ 40	$ 60	$ 100	$ 130

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 140,872	$ 213,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	12,708	12,469
Distributions from unconsolidated investment	28,114	66,140
Equity earnings from unconsolidated investment	(17,204)	(58,633)
Gain on asset sales and disposals	(4,809)	(955)
Asset impairments	87	132
Bad debt expense	538	813
Unit-based compensation expense	8,878	7,903
Amortization of debt issuance costs and other	(2,603)	1,043
Change in operating assets and liabilities:
Accounts receivable	5,711	4,090
Accounts payable	98	(850)
Accrued liabilities	(5,917)	(6,288)
Accrued interest	192	235
Deferred revenue	16,781	(4,963)
Other items, net	(1,173)	(1,399)
Net cash provided by operating activities	182,273	233,192
Cash flows from investing activities
Proceeds from asset sales and disposals	4,809	961
Return of long-term contract receivable	1,979	1,830
Capital expenditures	0	(10)
Net cash provided by investing activities	6,788	2,781
Cash flows from financing activities
Debt borrowings	152,850	215,034
Debt repayments	(110,696)	(176,061)
Redemption of preferred units	(71,666)	(178,334)
Warrant settlements (see Note 3)	(65,689)	(33,608)
Other items, net	(6,392)	(3,527)
Net cash used in financing activities	(170,150)	(256,653)
Net increase (decrease) in cash and cash equivalents	18,911	(20,680)
Cash and cash equivalents at beginning of period	11,989	39,091
Cash and cash equivalents at end of period	30,900	18,411
Supplemental cash flow information:
Cash paid for interest	11,466	9,484
Common Unitholders And General Partner [Member]
Cash flows from financing activities
Distributions to unitholders	(62,159)	(60,238)
Preferred Partner [Member]
Cash flows from financing activities
Distributions to unitholders	$ (6,398)	$ (19,919)

Note 1 - Basis of Presentation

9 Months Ended

Sep. 30, 2024

Basis of Presentation and Significant Accounting Policies [Text Block]

1. Basis of Presentation

Nature of Business

Principles of Consolidation and Reporting

Recently Issued Accounting Standard

Note 2 - Revenues From Contracts With Customers

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Text Block]

2. Revenues from Contracts with Customers

The following table presents the Partnership's Mineral Rights segment revenues from contracts with customers by major source:

	*For the Three Months Ended September 30,*					*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*		*2024*		*2023*
Coal royalty revenues	$	37,605		$	55,544	$	124,108	$	161,527
Production lease minimum revenues		437			850		1,773		2,025
Minimum lease straight-line revenues		4,117			4,464		12,414		13,414
Carbon neutral initiative revenues		(39	)		681		4,322		2,914
Property tax revenues		1,809			1,770		5,246		4,710
Wheelage revenues		2,072			2,385		7,082		9,538
Coal overriding royalty revenues		227			827		2,064		1,165
Lease amendment revenues		1,071			623		2,485		2,322
Aggregates royalty revenues		662			736		2,164		2,175
Oil and gas royalty revenues		1,317			324		6,956		5,126
Other revenues		1,127			329		1,956		895
Royalty and other mineral rights revenues	$	50,405		$	68,533	$	170,570	$	205,811
Transportation and processing services revenues		1,248			3,964		6,169		9,538
Total Mineral Rights segment revenues from contracts with customers	$	51,653		$	72,497	$	176,739	$	215,349

The following table details the Partnership's Mineral Rights segment receivables and liabilities resulting from contracts with customers:

	*September 30,*		*December 31,*
(In thousands)	*2024*		*2023*
Contract Assets
Accounts receivable, net	$	32,878	$	37,206
Other current assets, net ⁽¹⁾		1,047		429
Other long-term assets, net ⁽²⁾		1,725		—

Contract liabilities
Accounts payable⁽³⁾	$	114	$	—
Current portion of deferred revenue		5,823		4,599
Deferred revenue		53,912		38,356

⁽¹⁾	Other current assets, net includes short-term notes receivables from contracts with customers.
⁽²⁾	Other long-term assets, net includes amounts prepaid by NRP related to override agreements from contracts with customers as well as long-term lease amendment fee receivables from contracts with customers.
⁽³⁾	Accounts payable include override payments owed by NRP from contracts with customers.

The following table shows the activity related to the Partnership's Mineral Rights segment deferred revenue resulting from contracts with customers:

	*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*
Balance at beginning of period (current and non-current)	$	42,955		$	46,437
Increase due to minimums and lease amendment fees		28,319			11,525
Recognition of previously deferred revenue		(11,539	)		(16,487	)
Balance at end of period (current and non-current)	$	59,735		$	41,475

Lease Term ⁽¹⁾	*Weighted Average Remaining Years*		*Annual Minimum Payments*
0 - 5 years		1.9	$	14,949
5 - 10 years		5.5		18,222
10+ years		11.3		25,779
Total		7.1	$	58,950

⁽¹⁾	Lease term does not include renewal periods.

Note 3 - Class A Convertible Preferred Units and Warrants

9 Months Ended

Sep. 30, 2024

Preferred Stock [Text Block]

3. Class A Convertible Preferred Units and Warrants

Accounting for the Preferred Units and Warrants

Classification

Initial Measurement

Subsequent Measurement

Preferred Units

Warrants

Embedded Features

Note 4 - Common and Preferred Unit Distributions

9 Months Ended

Sep. 30, 2024

Partners' Capital Notes Disclosure [Text Block]

4. Common and Preferred Unit Distributions

The following table shows the cash distributions declared and paid to common and preferred unitholders during the nine months ended September 30, 2024 and 2023, respectively:


		*Common Units*				*Preferred Units*
Month Paid	*Period Covered by Distribution*	*Distribution per Unit*		Total Distribution ⁽¹⁾ (In thousands)		*Distribution per Unit*		*Total Distribution (In thousands)*
2024
February	October 1 - December 31, 2023	$	0.75	$	9,918	$	30.00	$	2,150
March ⁽²⁾	Special Distribution		2.44		32,268		—		—
May	January 1 - March 31, 2024		0.75		9,987		30.00		2,150
May ⁽³⁾	April 1 - May 8, 2024		—		—		12.33		493
August	April 1 - June 30, 2024		0.75		9,986		30.00		950
September ⁽⁴⁾	July 1 - September 3, 2024		—		—		20.68		655

2023
February	October 1 - December 31, 2022	$	0.75	$	9,571	$	30.00	$	7,500
February ⁽⁵⁾	January 1 - February 8, 2023		—		—		12.33		586
March ⁽⁶⁾	Special Distribution		2.43		31,329		—		—
May	January 1 - March 31, 2023		0.75		9,669		30.00		6,075
May ⁽⁷⁾	April 1 - May 5, 2023		—		—		11.33		406
June ⁽⁸⁾	April 1 - June 2, 2023		—		—		20.33		915
August	April 1 - June 30, 2023		0.75		9,669		30.00		3,650
August ⁽⁹⁾	July 1 - August 8, 2023		—		—		12.33		432
September ⁽¹⁰⁾	July 1 - September 12, 2023		—		—		23.67		355

⁽¹⁾	Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.
⁽²⁾	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023.
⁽³⁾	Relates to accrued distribution paid upon the redemption of 40,000 preferred units in May 2024.
⁽⁴⁾	Related to accrued distribution paid upon the redemption of 31,666 preferred units in September 2024.
⁽⁵⁾	Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.
⁽⁶⁾	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.
⁽⁷⁾	Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023.
⁽⁸⁾	Relates to accrued distribution paid upon redemption of 45,000 preferred units in June 2023.
⁽⁹⁾	Related to accrued distribution paid upon redemption of 35,000 preferred units in August 2023.
⁽¹⁰⁾	Related to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023.

Note 5 - Net Income Per Common Unit

9 Months Ended

Sep. 30, 2024

Earnings Per Share [Text Block]

5. Net Income Per Common Unit

The following table reconciles the numerator and denominator of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit:

	*For the Three Months Ended September 30,*						*For the Nine Months Ended September 30,*
(In thousands, except per unit data)	*2024*			*2023*			*2024*			*2023*
Basic net income per common unit
Net income attributable to common unitholders	$	26,578		$	42,951		$	109,896		$	135,199
Weighted average common units—basic		13,049			12,635			12,971			12,613
Basic net income per common unit	$	2.04		$	3.40		$	8.47		$	10.72

Diluted net income per common unit
Weighted average common units—basic		13,049			12,635			12,971			12,613
Plus: dilutive effect of preferred units		—			1,104			375			2,434
Plus: dilutive effect of warrants		—			1,492			186			1,296
Plus: dilutive effect of unvested unit-based awards		222			240			229			190
Weighted average common units—diluted		13,271			15,471			13,761			16,533

Net income	$	38,595		$	63,846		$	140,872		$	213,455
Less: income attributable to preferred unitholders		(655	)		(786	)		(1,148	)		(2,693	)
Less: redemption of preferred units		(10,819	)		(17,083	)		(24,485	)		(60,929	)
Diluted net income attributable to common unitholders and the general partner	$	27,121		$	45,977		$	115,239		$	149,833
Less: diluted net income attributable to the general partner		(543	)		(920	)		(2,305	)		(2,997	)
Diluted net income attributable to common unitholders	$	26,578		$	45,057		$	112,934		$	146,836

Diluted net income per common unit	$	2.00		$	2.91		$	8.21		$	8.88

Note 6 - Segment Information

9 Months Ended

Sep. 30, 2024

Segment Reporting Disclosure [Text Block]

6. Segment Information

The following table summarizes certain financial information for each of the Partnership's business segments:

	*Operating Segments*
(In thousands)	*Mineral Rights*		*Soda Ash*		*Corporate and Financing*			*Total*
For the Three Months Ended September 30, 2024
Revenues	$	52,217	$	—	$	—		$	52,217
Equity in earnings of Sisecam Wyoming		—		8,109		—			8,109
Gain on asset sales and disposals		1		—		—			1
Operating and maintenance expenses		6,762		24		—			6,786
Depreciation, depletion and amortization		4,725		—		5			4,730
General and administrative expenses		—		—		5,935			5,935
Asset impairments		87		—		—			87
Interest expense, net		—		—		4,194			4,194
Net income (loss)		40,644		8,085		(10,134	)		38,595

For the Three Months Ended September 30, 2023
Revenues	$	73,112	$	—	$	—		$	73,112
Equity in earnings of Sisecam Wyoming		—		12,401		—			12,401
Gain on asset sales and disposals		854		—		—			854
Operating and maintenance expenses		8,305		53		—			8,358
Depreciation, depletion and amortization		4,589		—		5			4,594
General and administrative expenses		—		—		5,669			5,669
Asset impairments		63		—		—			63
Interest expense, net		—		—		3,837			3,837
Net income (loss)		61,009		12,348		(9,511	)		63,846

For the Nine Months Ended September 30, 2024
Revenues	$	180,268	$	—	$	—		$	180,268
Equity in earnings of Sisecam Wyoming		—		17,204		—			17,204
Gain on asset sales and disposals		4,809		—		—			4,809
Operating and maintenance expenses		18,279		112		—			18,391
Depreciation, depletion and amortization		12,694		—		14			12,708
General and administrative expenses		—		—		18,193			18,193
Asset impairments		87		—		—			87
Interest expense, net		—		—		12,030			12,030
Net income (loss)		154,017		17,092		(30,237	)		140,872

For the Nine Months Ended September 30, 2023
Revenues	$	217,258	$	—	$	—		$	217,258
Equity in earnings of Sisecam Wyoming		—		58,633		—			58,633
Gain on asset sales and disposals		955		—		—			955
Operating and maintenance expenses		23,226		225		—			23,451
Depreciation, depletion and amortization		12,455		—		14			12,469
General and administrative expenses		—		—		17,157			17,157
Asset impairments		132		—		—			132
Interest expense, net		—		—		10,182			10,182
Net income (loss)		182,400		58,408		(27,353	)		213,455

Note 7 - Equity Investment

9 Months Ended

Sep. 30, 2024

Equity Method Investments and Joint Ventures Disclosure [Text Block]

7. Equity Investment

The Partnership accounts for its 49% investment in Sisecam Wyoming using the equity method of accounting. Activity related to this investment is as follows:

	*For the Three Months Ended September 30,*						*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*			*2024*			*2023*
Balance at beginning of period	$	265,935		$	290,900		$	276,549		$	306,470
Income allocation to NRP’s equity interests⁽¹⁾		9,315			13,608			20,718			62,184
Amortization of basis difference		(1,206	)		(1,207	)		(3,513	)		(3,551	)
Other comprehensive income (loss)		82			2,200			2,166			(16,472	)
Distributions		(6,320	)		(23,010	)		(28,114	)		(66,140	)
Balance at end of period	$	267,806		$	282,491		$	267,806		$	282,491

⁽¹⁾	Amounts reclassified into income out of accumulated other comprehensive loss were $1.5 million and $0.9 million for the three months ended September 30, 2024 and 2023, respectively and $4.5 million and $(17.4) million for the nine months ended September 30, 2024 and 2023, respectively.

	*For the Three Months Ended September 30,*				*For the Nine Months Ended September 30,*
(In thousands)	*2024*		*2023*		*2024*		*2023*
Net sales	$	160,975	$	180,232	$	438,385	$	588,725
Gross profit		25,976		34,454		64,584		148,063
Net income		19,009		27,772		42,281		126,906

Note 8 - Mineral Rights, Net

9 Months Ended

Sep. 30, 2024

Mineral Industries Disclosures [Text Block]

8. Mineral Rights, Net

The Partnership’s mineral rights consist of the following:

	*September 30, 2024*							*December 31, 2023*
(In thousands)	*Carrying Value*		*Accumulated Depletion*			*Net Book Value*		*Carrying Value*		*Accumulated Depletion*			*Net Book Value*
Coal properties	$	660,961	$	(296,781	)	$	364,180	$	661,256	$	(285,470	)	$	375,786
Aggregates properties		8,655		(4,003	)		4,652		8,655		(3,761	)		4,894
Oil and gas royalty properties		12,354		(10,443	)		1,911		12,354		(10,082	)		2,272
Other		13,143		(1,612	)		11,531		13,143		(1,612	)		11,531
Total mineral rights, net	$	695,113	$	(312,839	)	$	382,274	$	695,408	$	(300,925	)	$	394,483

Note 9 - Debt, Net

9 Months Ended

Sep. 30, 2024

Debt Disclosure [Text Block]

9. Debt, Net

The Partnership's debt consists of the following:

	*September 30,*			*December 31,*
(In thousands)	*2024*			*2023*
Opco Credit Facility	$	154,684		$	95,834
Opco Senior Notes
5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024	$	—		$	12,685
8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024		—			4,012
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		34,262			34,262
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		8,732			8,732
Total Opco Senior Notes	$	42,994		$	59,691
Total debt at face value	$	197,678		$	155,525
Net unamortized debt issuance costs		(315	)		(467	)
Total debt, net	$	197,363		$	155,058
Less: current portion of long-term debt		(14,226	)		(30,785	)
Total long-term debt, net	$	183,137		$	124,273

Opco Debt

Opco Credit Facility

•

A leverage ratio of consolidated indebtedness to EBITDDA (in each case as defined in the Opco Credit Facility) not to exceed 3.0x As of September 30, 2024, this ratio was 0.8x; and

•

Opco Senior Notes

Note 10 - Fair Value Measurements

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Text Block]

10. Fair Value Measurements

Fair Value of Financial Assets and Liabilities

The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable:

			*September 30, 2024*				*December 31, 2023*
	*Fair Value*		*Carrying*		*Estimated*		*Carrying*		*Estimated*
(In thousands)	*Hierarchy Level*		*Value*		*Fair Value*		*Value*		*Fair Value*
Debt:
Opco Senior Notes ⁽¹⁾		3	$	42,679	$	40,992	$	59,224	$	56,533
Opco Credit Facility ⁽²⁾		3		154,684		154,684		95,834		95,384

Assets:
Contract receivable, net (current and long-term) ⁽³⁾		3	$	26,997	$	23,223	$	28,946	$	24,492

⁽¹⁾	The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility.
⁽²⁾	The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay the debt at any time without penalty.
⁽³⁾	The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at September 30, 2024 and December 31, 2023.

Note 11 - Related Party Transactions

9 Months Ended

Sep. 30, 2024

11. Related Party Transactions

Affiliates of our General Partner

Related party general and administrative expenses included on the Partnership's Consolidated Statement of Comprehensive Income are as follows:

	*For the Three Months Ended September 30,*				*For the Nine Months Ended September 30,*
(In thousands)	*2024*		*2023*		*2024*		*2023*
Operating and maintenance expenses	$	2,014	$	1,663	$	5,483	$	5,094
General and administrative expenses		1,296		1,287		4,117		3,860

Note 12 - Major Customers

9 Months Ended

Sep. 30, 2024

Concentration Risk Disclosure [Text Block]

12. Major Customers

Revenues from customers that exceeded 10 percent of total revenues for any of the periods presented below are as follows:

	*For the Three Months Ended September 30,*										*For the Nine Months Ended September 30,*
	*2024*					*2023*					*2024*					*2023*
(In thousands)	*Revenues*		*Percent*			*Revenues*		*Percent*			*Revenues*		*Percent*			*Revenues*		*Percent*
Alpha Metallurgical Resources, Inc. ⁽¹⁾	$	14,556		28	%	$	17,219		20	%	$	53,345		30	%	$	61,122		22	%
Foresight Energy Resources LLC ("Foresight") ⁽¹⁾	$	7,421		14	%	$	18,600		22	%	$	30,003		17	%	$	43,453		16	%
Alabama Kanu Holdings, LLC ^{(1) (2)}	$	7,143		14	%	$	8,892		10	%	$	21,344		12	%	$	24,962		9	%

⁽¹⁾	Revenues from Alpha Metallurgical Resources, Inc., Foresight and Alabama Kanu Holdings, LLC are included within the Partnership's Mineral Rights segment.
⁽²⁾	Alabama Kanu Holdings, LLC purchased Hatfield Metallurgical Holdings, LLC in August 2024.

Note 13 - Commitments and Contingencies

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies Disclosure [Text Block]

13. Commitments and Contingencies

Note 14 - Unit-based Compensation

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Text Block]

14. Unit-Based Compensation

A summary of the unit activity in the outstanding grants during 2024 is as follows:

(In thousands)	*Common Units*			*Weighted Average Grant Date Fair Value per Common Unit*
Outstanding at January 1, 2024		483		$	46.21
Granted		65		$	103.50
Fully vested and issued		(197	)	$	38.76
Forfeitures		(1	)	$	90.70
Outstanding at September 30, 2024		350		$	60.81

Note 15 - Financing Transaction

9 Months Ended

Sep. 30, 2024

Financing Receivables [Text Block]

15. Financing Transaction

Note 16 - Credit Losses

9 Months Ended

Sep. 30, 2024

Credit Loss, Financial Instrument [Text Block]

16. Credit Losses

As of September 30, 2024 and December 31, 2023, NRP had the following current expected credit loss (“CECL”) allowance related to its receivables and long-term contract receivable:

	*September 30, 2024*							*December 31, 2023*
(In thousands)	*Gross*		*CECL Allowance*			*Net*		*Gross*		*CECL Allowance*			*Net*
Receivables	$	44,356	$	(5,583	)	$	38,773	$	47,170	$	(5,655	)	$	41,515
Long-term contract receivable		25,081		(869	)		24,212		27,265		(944	)		26,321
Total	$	69,437	$	(6,452	)	$	62,985	$	74,435	$	(6,599	)	$	67,836

Note 17 - Subsequent Events

9 Months Ended

Sep. 30, 2024

Subsequent Events [Text Block]

17. Subsequent Events

The following represents material events that have occurred subsequent to September 30, 2024 through the time of the Partnership’s filing of its Quarterly Report on Form 10-Q with the SEC:

Opco Credit Facility Amendment

Common Unit and Preferred Unit Distributions

In November 2024, the Board of Directors declared a distribution of $0.75 per common unit with respect to the third quarter of 2024.

Insider Trading Arrangements	9 Months Ended
Insider Trading Arrangements	Sep. 30, 2024
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	ITEM 5. OTHER INFORMATION None.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Note 2 - Revenues From Contracts With Customers (Tables)

9 Months Ended

Sep. 30, 2024

Disaggregation of Revenue [Table Text Block]

	*For the Three Months Ended September 30,*					*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*		*2024*		*2023*
Coal royalty revenues	$	37,605		$	55,544	$	124,108	$	161,527
Production lease minimum revenues		437			850		1,773		2,025
Minimum lease straight-line revenues		4,117			4,464		12,414		13,414
Carbon neutral initiative revenues		(39	)		681		4,322		2,914
Property tax revenues		1,809			1,770		5,246		4,710
Wheelage revenues		2,072			2,385		7,082		9,538
Coal overriding royalty revenues		227			827		2,064		1,165
Lease amendment revenues		1,071			623		2,485		2,322
Aggregates royalty revenues		662			736		2,164		2,175
Oil and gas royalty revenues		1,317			324		6,956		5,126
Other revenues		1,127			329		1,956		895
Royalty and other mineral rights revenues	$	50,405		$	68,533	$	170,570	$	205,811
Transportation and processing services revenues		1,248			3,964		6,169		9,538
Total Mineral Rights segment revenues from contracts with customers	$	51,653		$	72,497	$	176,739	$	215,349

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	*September 30,*		*December 31,*
(In thousands)	*2024*		*2023*
Contract Assets
Accounts receivable, net	$	32,878	$	37,206
Other current assets, net ⁽¹⁾		1,047		429
Other long-term assets, net ⁽²⁾		1,725		—

Contract liabilities
Accounts payable⁽³⁾	$	114	$	—
Current portion of deferred revenue		5,823		4,599
Deferred revenue		53,912		38,356

	*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*
Balance at beginning of period (current and non-current)	$	42,955		$	46,437
Increase due to minimums and lease amendment fees		28,319			11,525
Recognition of previously deferred revenue		(11,539	)		(16,487	)
Balance at end of period (current and non-current)	$	59,735		$	41,475

Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]

Lease Term ⁽¹⁾	*Weighted Average Remaining Years*		*Annual Minimum Payments*
0 - 5 years		1.9	$	14,949
5 - 10 years		5.5		18,222
10+ years		11.3		25,779
Total		7.1	$	58,950

Note 4 - Common and Preferred Unit Distributions (Tables)

9 Months Ended

Sep. 30, 2024

Distributions Made to Limited Partner, by Distribution [Table Text Block]


		*Common Units*				*Preferred Units*
Month Paid	*Period Covered by Distribution*	*Distribution per Unit*		Total Distribution ⁽¹⁾ (In thousands)		*Distribution per Unit*		*Total Distribution (In thousands)*
2024
February	October 1 - December 31, 2023	$	0.75	$	9,918	$	30.00	$	2,150
March ⁽²⁾	Special Distribution		2.44		32,268		—		—
May	January 1 - March 31, 2024		0.75		9,987		30.00		2,150
May ⁽³⁾	April 1 - May 8, 2024		—		—		12.33		493
August	April 1 - June 30, 2024		0.75		9,986		30.00		950
September ⁽⁴⁾	July 1 - September 3, 2024		—		—		20.68		655

2023
February	October 1 - December 31, 2022	$	0.75	$	9,571	$	30.00	$	7,500
February ⁽⁵⁾	January 1 - February 8, 2023		—		—		12.33		586
March ⁽⁶⁾	Special Distribution		2.43		31,329		—		—
May	January 1 - March 31, 2023		0.75		9,669		30.00		6,075
May ⁽⁷⁾	April 1 - May 5, 2023		—		—		11.33		406
June ⁽⁸⁾	April 1 - June 2, 2023		—		—		20.33		915
August	April 1 - June 30, 2023		0.75		9,669		30.00		3,650
August ⁽⁹⁾	July 1 - August 8, 2023		—		—		12.33		432
September ⁽¹⁰⁾	July 1 - September 12, 2023		—		—		23.67		355

Note 5 - Net Income Per Common Unit (Tables)

9 Months Ended

Sep. 30, 2024

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	*For the Three Months Ended September 30,*						*For the Nine Months Ended September 30,*
(In thousands, except per unit data)	*2024*			*2023*			*2024*			*2023*
Basic net income per common unit
Net income attributable to common unitholders	$	26,578		$	42,951		$	109,896		$	135,199
Weighted average common units—basic		13,049			12,635			12,971			12,613
Basic net income per common unit	$	2.04		$	3.40		$	8.47		$	10.72

Diluted net income per common unit
Weighted average common units—basic		13,049			12,635			12,971			12,613
Plus: dilutive effect of preferred units		—			1,104			375			2,434
Plus: dilutive effect of warrants		—			1,492			186			1,296
Plus: dilutive effect of unvested unit-based awards		222			240			229			190
Weighted average common units—diluted		13,271			15,471			13,761			16,533

Net income	$	38,595		$	63,846		$	140,872		$	213,455
Less: income attributable to preferred unitholders		(655	)		(786	)		(1,148	)		(2,693	)
Less: redemption of preferred units		(10,819	)		(17,083	)		(24,485	)		(60,929	)
Diluted net income attributable to common unitholders and the general partner	$	27,121		$	45,977		$	115,239		$	149,833
Less: diluted net income attributable to the general partner		(543	)		(920	)		(2,305	)		(2,997	)
Diluted net income attributable to common unitholders	$	26,578		$	45,057		$	112,934		$	146,836

Diluted net income per common unit	$	2.00		$	2.91		$	8.21		$	8.88

Note 6 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2024

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	*Operating Segments*
(In thousands)	*Mineral Rights*		*Soda Ash*		*Corporate and Financing*			*Total*
For the Three Months Ended September 30, 2024
Revenues	$	52,217	$	—	$	—		$	52,217
Equity in earnings of Sisecam Wyoming		—		8,109		—			8,109
Gain on asset sales and disposals		1		—		—			1
Operating and maintenance expenses		6,762		24		—			6,786
Depreciation, depletion and amortization		4,725		—		5			4,730
General and administrative expenses		—		—		5,935			5,935
Asset impairments		87		—		—			87
Interest expense, net		—		—		4,194			4,194
Net income (loss)		40,644		8,085		(10,134	)		38,595

For the Three Months Ended September 30, 2023
Revenues	$	73,112	$	—	$	—		$	73,112
Equity in earnings of Sisecam Wyoming		—		12,401		—			12,401
Gain on asset sales and disposals		854		—		—			854
Operating and maintenance expenses		8,305		53		—			8,358
Depreciation, depletion and amortization		4,589		—		5			4,594
General and administrative expenses		—		—		5,669			5,669
Asset impairments		63		—		—			63
Interest expense, net		—		—		3,837			3,837
Net income (loss)		61,009		12,348		(9,511	)		63,846

For the Nine Months Ended September 30, 2024
Revenues	$	180,268	$	—	$	—		$	180,268
Equity in earnings of Sisecam Wyoming		—		17,204		—			17,204
Gain on asset sales and disposals		4,809		—		—			4,809
Operating and maintenance expenses		18,279		112		—			18,391
Depreciation, depletion and amortization		12,694		—		14			12,708
General and administrative expenses		—		—		18,193			18,193
Asset impairments		87		—		—			87
Interest expense, net		—		—		12,030			12,030
Net income (loss)		154,017		17,092		(30,237	)		140,872

For the Nine Months Ended September 30, 2023
Revenues	$	217,258	$	—	$	—		$	217,258
Equity in earnings of Sisecam Wyoming		—		58,633		—			58,633
Gain on asset sales and disposals		955		—		—			955
Operating and maintenance expenses		23,226		225		—			23,451
Depreciation, depletion and amortization		12,455		—		14			12,469
General and administrative expenses		—		—		17,157			17,157
Asset impairments		132		—		—			132
Interest expense, net		—		—		10,182			10,182
Net income (loss)		182,400		58,408		(27,353	)		213,455

Note 7 - Equity Investment (Tables)

9 Months Ended

Sep. 30, 2024

Equity Method Investments [Table Text Block]

	*For the Three Months Ended September 30,*						*For the Nine Months Ended September 30,*
(In thousands)	*2024*			*2023*			*2024*			*2023*
Balance at beginning of period	$	265,935		$	290,900		$	276,549		$	306,470
Income allocation to NRP’s equity interests⁽¹⁾		9,315			13,608			20,718			62,184
Amortization of basis difference		(1,206	)		(1,207	)		(3,513	)		(3,551	)
Other comprehensive income (loss)		82			2,200			2,166			(16,472	)
Distributions		(6,320	)		(23,010	)		(28,114	)		(66,140	)
Balance at end of period	$	267,806		$	282,491		$	267,806		$	282,491

	*For the Three Months Ended September 30,*				*For the Nine Months Ended September 30,*
(In thousands)	*2024*		*2023*		*2024*		*2023*
Net sales	$	160,975	$	180,232	$	438,385	$	588,725
Gross profit		25,976		34,454		64,584		148,063
Net income		19,009		27,772		42,281		126,906

Note 8 - Mineral Rights, Net (Tables)

9 Months Ended

Sep. 30, 2024

Mineral Properties Disclosure [Table Text Block]

	*September 30, 2024*							*December 31, 2023*
(In thousands)	*Carrying Value*		*Accumulated Depletion*			*Net Book Value*		*Carrying Value*		*Accumulated Depletion*			*Net Book Value*
Coal properties	$	660,961	$	(296,781	)	$	364,180	$	661,256	$	(285,470	)	$	375,786
Aggregates properties		8,655		(4,003	)		4,652		8,655		(3,761	)		4,894
Oil and gas royalty properties		12,354		(10,443	)		1,911		12,354		(10,082	)		2,272
Other		13,143		(1,612	)		11,531		13,143		(1,612	)		11,531
Total mineral rights, net	$	695,113	$	(312,839	)	$	382,274	$	695,408	$	(300,925	)	$	394,483

Note 9 - Debt, Net (Tables)

9 Months Ended

Sep. 30, 2024

Schedule of Long-Term Debt Instruments [Table Text Block]

	*September 30,*			*December 31,*
(In thousands)	*2024*			*2023*
Opco Credit Facility	$	154,684		$	95,834
Opco Senior Notes
5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024	$	—		$	12,685
8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024		—			4,012
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		34,262			34,262
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		8,732			8,732
Total Opco Senior Notes	$	42,994		$	59,691
Total debt at face value	$	197,678		$	155,525
Net unamortized debt issuance costs		(315	)		(467	)
Total debt, net	$	197,363		$	155,058
Less: current portion of long-term debt		(14,226	)		(30,785	)
Total long-term debt, net	$	183,137		$	124,273

Note 10 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2024

Fair Value Option, Disclosures [Table Text Block]

			*September 30, 2024*				*December 31, 2023*
	*Fair Value*		*Carrying*		*Estimated*		*Carrying*		*Estimated*
(In thousands)	*Hierarchy Level*		*Value*		*Fair Value*		*Value*		*Fair Value*
Debt:
Opco Senior Notes ⁽¹⁾		3	$	42,679	$	40,992	$	59,224	$	56,533
Opco Credit Facility ⁽²⁾		3		154,684		154,684		95,834		95,384

Assets:
Contract receivable, net (current and long-term) ⁽³⁾		3	$	26,997	$	23,223	$	28,946	$	24,492

Note 11 - Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2024

	*For the Three Months Ended September 30,*				*For the Nine Months Ended September 30,*
(In thousands)	*2024*		*2023*		*2024*		*2023*
Operating and maintenance expenses	$	2,014	$	1,663	$	5,483	$	5,094
General and administrative expenses		1,296		1,287		4,117		3,860

Note 12 - Major Customers (Tables)

9 Months Ended

Sep. 30, 2024

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	*For the Three Months Ended September 30,*										*For the Nine Months Ended September 30,*
	*2024*					*2023*					*2024*					*2023*
(In thousands)	*Revenues*		*Percent*			*Revenues*		*Percent*			*Revenues*		*Percent*			*Revenues*		*Percent*
Alpha Metallurgical Resources, Inc. ⁽¹⁾	$	14,556		28	%	$	17,219		20	%	$	53,345		30	%	$	61,122		22	%
Foresight Energy Resources LLC ("Foresight") ⁽¹⁾	$	7,421		14	%	$	18,600		22	%	$	30,003		17	%	$	43,453		16	%
Alabama Kanu Holdings, LLC ^{(1) (2)}	$	7,143		14	%	$	8,892		10	%	$	21,344		12	%	$	24,962		9	%

Note 14 - Unit-based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement, Activity [Table Text Block]

(In thousands)	*Common Units*			*Weighted Average Grant Date Fair Value per Common Unit*
Outstanding at January 1, 2024		483		$	46.21
Granted		65		$	103.50
Fully vested and issued		(197	)	$	38.76
Forfeitures		(1	)	$	90.70
Outstanding at September 30, 2024		350		$	60.81

Note 16 - Credit Losses (Tables)

9 Months Ended

Sep. 30, 2024

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

	*September 30, 2024*							*December 31, 2023*
(In thousands)	*Gross*		*CECL Allowance*			*Net*		*Gross*		*CECL Allowance*			*Net*
Receivables	$	44,356	$	(5,583	)	$	38,773	$	47,170	$	(5,655	)	$	41,515
Long-term contract receivable		25,081		(869	)		24,212		27,265		(944	)		26,321
Total	$	69,437	$	(6,452	)	$	62,985	$	74,435	$	(6,599	)	$	67,836

Note 1 - Basis of Presentation (Details Textual)	9 Months Ended
Note 1 - Basis of Presentation (Details Textual)	Sep. 30, 2024
Number of Operating Segments	2
Number of Wholly Owned Operating Companies	1
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49.00%

Note 2 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from contract with customers	$ 50,405	$ 68,533	$ 170,570	$ 205,811
Mineral Rights Segment [Member] \| Operating Segments [Member]
Revenue from contract with customers	51,653	72,497	176,739	215,349
Coal Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	37,605	55,544	124,108	161,527
Production Lease Minimum Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	437	850	1,773	2,025
Minimum Lease Straight-line Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	4,117	4,464	12,414	13,414
Carbon Neutral Initiatives [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	(39)	681	4,322	2,914
Property Tax Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	1,809	1,770	5,246	4,710
Wheelage Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	2,072	2,385	7,082	9,538
Coal Overriding Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	227	827	2,064	1,165
Lease Amendment Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	1,071	623	2,485	2,322
Aggregates Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	662	736	2,164	2,175
Oil and Gas Royalty Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	1,317	324	6,956	5,126
Other Revenues [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	1,127	329	1,956	895
Transportation and Processing Services [Member] \| Mineral Rights Segment [Member]
Revenue from contract with customers	$ 1,248	$ 3,964	$ 6,169	$ 9,538

Note 2 - Revenue From Contracts With Customers - Assets and Liabilities (Details) - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Dec. 31, 2023

Accounts payable

$ 984

$ 885

Current portion of deferred revenue

5,823

4,599

Deferred revenue

53,912

38,356

Balance

42,955

$ 46,437

Increase due to minimums and lease amendment fees

28,319

11,525

Recognition of previously deferred revenue

(11,539)

(16,487)

Balance

59,735

$ 41,475

Coal Royalty Revenues [Member]

Accounts payable

^[1]

114

Current portion of deferred revenue

5,823

4,599

Deferred revenue

53,912

38,356

Coal Royalty Revenues [Member] | Accounts Receivable [Member]

Contract with customer, current

32,878

37,206

Coal Royalty Revenues [Member] | Other Current Assets [Member]

Contract with customer, current

^[2]

1,047

429

Coal Royalty Revenues [Member] | Other Long Term Assets [Member]

Contract with customer, current

^[3]

$ 1,725

$ 0

[1]	Accounts payable include override payments owed by NRP from contracts with customers.
[2]	Other current assets, net includes short-term notes receivables from contracts with customers.
[3]	Other long-term assets, net includes amounts prepaid by NRP related to override agreements from contracts with customers as well as long-term lease amendment fee receivables from contracts with customers.

Note 2 - Revenue From Contracts With Customers - Operating Lease Payments Receivable (Details)
$ in Thousands

Sep. 30, 2024

USD ($)

^[1]

7 years 1 month 6 days

Lease Term, 0 to 5 Years [Member]

$ 58,950

1 year 10 months 24 days

Lease Term, 5 to 10 Years [Member]

$ 14,949

5 years 6 months

Lease Term, Greater Than 10 Years [Member]

$ 18,222

11 years 3 months 18 days

$ 25,779

[1]	Lease term does not include renewal periods.

Note 3 - Class A Convertible Preferred Units and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended								3 Months Ended	9 Months Ended
	Feb. 14, 2024	Feb. 08, 2024	Feb. 07, 2024	Jan. 29, 2024	Sep. 18, 2023	Mar. 02, 2017	Sep. 30, 2024	May 31, 2024	Apr. 30, 2024	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	May 31, 2023	Feb. 28, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Temporary Equity, Par or Stated Value Per Share (in dollars per share)							$ 1,000								$ 1,000	$ 1,000		$ 1,000
Preferred Units, Number of Redeemed Units (in shares)							31,666	40,000		15,001	35,000	45,000	35,834	47,499
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests							$ 0								$ 0	$ 0		$ 47,181
Volume Weighted Average Price of Share (in dollars per share)									$ 90.33
Warrants and Rights Outstanding							$ 0								$ 0	$ 0		$ 23,095
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)						1,750,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 22.81	$ 22.81
Class of Warrant or Right, Repurchased and Retired (in shares)					752,500
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right Warrants, Issued (in shares)						2,250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 34	$ 34	$ 34	$ 34	$ 34	$ 34	$ 34		$ 34						$ 34	$ 34		$ 34
Class of Warrant or Right, Repurchased and Retired (in shares)					60,000				320,335							1,540,000
Class Of Warrants, Warrants Exercised (in shares)	500,000	128,750	128,750	462,165
Warrants and Rights Settled	$ 29,700	$ 7,900	$ 8,000	$ 10,000	$ 33,600				$ 10,000
Partners' Capital Account, Units, Warrant Settlements (in shares)				198,767					89,059
Volume Weighted Average Price of Share (in dollars per share)	$ 93.47	$ 95.63	$ 96.29	$ 97.62
Class of Warrant or Right, Outstanding (in shares)							0								0	0		1,540,000
Warrants and Rights Outstanding																		$ 23,100
Originally Issued Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							4,000,000								4,000,000	4,000,000
Class A Convertible Preferred Units [Member]
Preferred Units, Issued (in shares)						250,000
Temporary Equity, Par or Stated Value Per Share (in dollars per share)						$ 1,000
Preferred Units Origination Fee Percent						2.50%
Preferred Stock, Dividend Rate, Percentage						12.00%
Preferred Units, Number of Redeemed Units (in shares)															31,666	71,666	178,334
Preferred Units, Value of Redeemed Units															$ 31,700	$ 71,700	$ 178,300
Preferred Units, Outstanding (in shares)							0								0	0		71,666
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests																		$ 47,200
Preferred Stock [Member]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total						$ 250,000

Note 4 - Common and Preferred Unit Distributions (Details Textual) - USD ($) $ in Thousands	1 Months Ended							3 Months Ended						9 Months Ended
	Sep. 30, 2024	May 31, 2024	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	May 31, 2023	Feb. 28, 2023	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders								$ (655)	$ (1,440)	$ (2,150)	$ (2,936)	$ (4,970)	$ (6,660)	$ (4,248)	$ (14,568)
Preferred Stock Redemption Premium								10,819			17,083			24,485	60,929
Preferred Units, Number of Redeemed Units (in shares)	31,666	40,000	15,001	35,000	45,000	35,834	47,499
Common Unitholders And General Partner [Member]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders								$ (700)			$ (2,900)			$ (4,200)	$ (14,600)
Partner, General [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest														2.00%

Note 4 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($)
$ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

Jun. 30, 2023

Sep. 30, 2024

Aug. 31, 2024

May 31, 2024

Mar. 31, 2024

Feb. 29, 2024

Sep. 30, 2023

Aug. 31, 2023

May 31, 2023

Mar. 31, 2023

Feb. 28, 2023

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Preferred Partner [Member] | Preferred Stock [Member]

$ 9,986

$ 9,987

$ 42,186

$ 9,669

$ 40,900

Distribution per unit, common units (in dollars per share)

$ 30

Preferred Partner [Member] | Preferred Stock [Member] | March 2024 Special Distribution [Member]

$ 950

$ 2,150

$ 3,650

$ 6,075

$ 7,500

Distribution per unit, common units (in dollars per share)

^[1]

$ 0

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering April 1 - May 8, 2024 [Member]

^[1]

$ 0

Distribution per unit, common units (in dollars per share)

^[2]

$ 12.33

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering July 1 - September 3, 2024 [Member]

^[2]

$ 493

Distribution per unit, common units (in dollars per share)

^[3]

$ 20.68

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering January 1 - February 8, 2023 [Member]

^[3]

$ 655

Distribution per unit, common units (in dollars per share)

^[4]

$ 12.33

Preferred Partner [Member] | Preferred Stock [Member] | March 2023 Special Distribution [Member]

^[4]

$ 586

Distribution per unit, common units (in dollars per share)

^[5]

$ 0

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering April 1 - May 5, 2023 [Member]

^[5]

$ 0

Distribution per unit, common units (in dollars per share)

^[6]

$ 11.33

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering April 1 - June 2, 2023 [Member]

^[6]

$ 406

Distribution per unit, common units (in dollars per share)

^[7]

$ 20.33

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering July 1 - August 8, 2023 [Member]

^[7]

$ 915

Distribution per unit, common units (in dollars per share)

^[8]

$ 12.33

Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering July 1 - September 12, 2023 [Member]

^[8]

$ 432

Distribution per unit, common units (in dollars per share)

^[9]

$ 23.67

Common Unitholders, General Partner [Member]

^[9]

$ 355

Distribution per unit, common units (in dollars per share)

$ 0.75

Common Unitholders, General Partner [Member] | March 2024 Special Distribution [Member]

^[10]

$ 9,986

$ 9,987

$ 9,918

$ 9,669

$ 9,571

Distribution per unit, common units (in dollars per share)

^[1]

$ 2.44

Common Unitholders, General Partner [Member] | Distributions Covering April 1 - May 8, 2024 [Member]

^[1],[10]

$ 32,268

Distribution per unit, common units (in dollars per share)

^[2]

$ 0

Common Unitholders, General Partner [Member] | Distributions Covering July 1 - September 3, 2024 [Member]

^[2],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[3]

$ 0

Common Unitholders, General Partner [Member] | Distributions Covering January 1 - February 8, 2023 [Member]

^[3],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[4]

$ 0

Common Unitholders, General Partner [Member] | March 2023 Special Distribution [Member]

^[4],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[5]

$ 2.43

Common Unitholders, General Partner [Member] | Distributions Covering April 1 - May 5, 2023 [Member]

^[5],[10]

$ 31,329

Distribution per unit, common units (in dollars per share)

^[6]

$ 0

Common Unitholders, General Partner [Member] | Distributions Covering April 1 - June 2, 2023 [Member]

^[6],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[7]

$ 0

Common Unitholders, General Partner [Member] | Distributions Covering July 1 - August 8, 2023 [Member]

^[7],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[8]

$ 0

Common Unitholders, General Partner [Member] | Distributions Covering July 1 - September 12, 2023 [Member]

^[8],[10]

$ 0

Distribution per unit, common units (in dollars per share)

^[9]

$ 0

Net income attributable to common unitholders

^[9],[10]

$ 0

[1]	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023.
[2]	Relates to accrued distribution paid upon the redemption of 40,000 preferred units in May 2024.
[3]	Related to accrued distribution paid upon the redemption of 31,666 preferred units in September 2024.
[4]	Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.
[5]	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.
[6]	Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023.
[7]	Relates to accrued distribution paid upon redemption of 45,000 preferred units in June 2023.
[8]	Related to accrued distribution paid upon redemption of 35,000 preferred units in August 2023.
[9]	Related to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023.
[10]	Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest

Note 5 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2024

Jun. 30, 2024

^[2]

Mar. 31, 2024

^[3]

Sep. 30, 2023

Jun. 30, 2023

^[5]

Mar. 31, 2023

^[6]

Sep. 30, 2024

Sep. 30, 2023

$ 26,578

$ 42,951

$ 109,896

$ 135,199

Weighted average common units—basic (in shares)

13,049

12,635

12,971

12,613

Basic net income per common unit (in dollars per share)

$ 2.04

$ 3.4

$ 8.47

$ 10.72

Plus: dilutive effect of preferred units (in shares)

1,104

375

2,434

Plus: dilutive effect of warrants (in shares)

1,492

186

1,296

Plus: dilutive effect of unvested unit-based awards (in shares)

222

240

229

190

Weighted average common units—diluted (in shares)

13,271

15,471

13,761

16,533

Less: income attributable to preferred unitholders

$ 38,595

^[1]

$ 46,064

$ 56,213

$ 63,846

^[4]

$ 70,334

$ 79,275

$ 140,872

$ 213,455

(655)

(786)

(1,148)

(2,693)

Less: redemption of preferred units

(10,819)

(17,083)

(24,485)

(60,929)

Diluted net income attributable to common unitholders and the general partner

27,121

45,977

115,239

149,833

Less: diluted net income attributable to the general partner

(543)

(920)

(2,305)

(2,997)

Diluted net income attributable to common unitholders

$ 26,578

$ 45,057

$ 112,934

$ 146,836

Diluted net income per common unit (in dollars per share)

$ 2

$ 2.91

$ 8.21

$ 8.88

[1]	Net income includes $0.66 million of income attributable to preferred unitholders that accumulated during the period, of which $0.64 million is allocated to the common unitholders and $0.01 million is allocated to the general partner.
[2]	Net income includes $1.44 million of income attributable to preferred unitholders that accumulated during the period, of which $1.41 million is allocated to the common unitholders and $0.03 million is allocated to the general partner.
[3]	Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.
[4]	Net income includes $2.9 million of income attributable to preferred unitholders that accumulated during the period, of which $2.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[5]	Net income includes $5.0 million of income attributable to preferred unitholders that accumulated during the period, of which $4.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[6]	Net income includes $6.7 million of income attributable to preferred unitholders that accumulated during the period, of which $6.5 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.

Note 6 - Segment Information (Details Textual)	9 Months Ended
Note 6 - Segment Information (Details Textual)	Sep. 30, 2024
Number of Operating Segments	2
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49.00%

Note 6 - Segment Information - Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues	$ 52,217	$ 73,112	$ 180,268	$ 217,258
Equity in earnings of Sisecam Wyoming	8,109	12,401	17,204	58,633
Gain on asset sales and disposals	1	854	4,809	955
Operating and maintenance expenses	6,786	8,358	18,391	23,451
Depreciation, depletion and amortization	4,730	4,594	12,708	12,469
General and administrative expenses	5,935	5,669	18,193	17,157
Asset impairments	87	63	87	132
Interest expense, net	4,194	3,837	12,030	10,182
Net income (loss)	38,595	63,846	140,872	213,455
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	0	0	0	0
Equity in earnings of Sisecam Wyoming	0	0	0	0
Gain on asset sales and disposals	0	0	0	0
Operating and maintenance expenses	0	0	0	0
Depreciation, depletion and amortization	5	5	14	14
General and administrative expenses	5,935	5,669	18,193	17,157
Asset impairments	0	0	0	0
Interest expense, net	4,194	3,837	12,030	10,182
Net income (loss)	(10,134)	(9,511)	(30,237)	(27,353)
Mineral Rights Segment [Member] \| Operating Segments [Member]
Revenues	52,217	73,112	180,268	217,258
Equity in earnings of Sisecam Wyoming	0	0	0	0
Gain on asset sales and disposals	1	854	4,809	955
Operating and maintenance expenses	6,762	8,305	18,279	23,226
Depreciation, depletion and amortization	4,725	4,589	12,694	12,455
General and administrative expenses	0	0	0	0
Asset impairments	87	63	87	132
Interest expense, net	0	0	0	0
Net income (loss)	40,644	61,009	154,017	182,400
Soda Ash Segment [Member] \| Operating Segments [Member]
Revenues	0	0	0	0
Equity in earnings of Sisecam Wyoming	8,109	12,401	17,204	58,633
Gain on asset sales and disposals	0	0	0	0
Operating and maintenance expenses	24	53	112	225
Depreciation, depletion and amortization	0	0	0	0
General and administrative expenses	0	0	0	0
Asset impairments	0	0	0	0
Interest expense, net	0	0	0	0
Net income (loss)	$ 8,085	$ 12,348	$ 17,092	$ 58,408

Note 7 - Equity Investment (Details Textual) - Sisecam Wyoming [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity Method Investment, Ownership Percentage	49.00%		49.00%
Reclassification Out Of Accumulated Other Comprehensive Income (Loss)	$ 1.5	$ 0.9	$ 4.5	$ (17.4)

Note 7 - Equity Investment - Investment Activity (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Sep. 30, 2024

Sep. 30, 2023

Beginning Balance

$ 276,549

Ending Balance

$ 267,806

267,806

38,595

^[1]

$ 46,064

^[2]

56,213

^[3]

$ 63,846

^[4]

$ 70,334

^[5]

$ 79,275

^[6]

140,872

$ 213,455

Sisecam Wyoming [Member]

160,975

180,232

438,385

588,725

Gross profit

25,976

34,454

64,584

148,063

Income allocation to NRP’s equity interests (1)

19,009

27,772

42,281

126,906

Sisecam Wyoming [Member]

Beginning Balance

265,935

$ 276,549

290,900

$ 306,470

276,549

306,470

^[7]

9,315

13,608

20,718

62,184

Amortization of basis difference

(1,206)

(1,207)

(3,513)

(3,551)

Other comprehensive income (loss)

2,200

2,166

(16,472)

Distributions

(6,320)

(23,010)

(28,114)

(66,140)

Ending Balance

$ 267,806

$ 265,935

$ 282,491

$ 290,900

$ 267,806

$ 282,491

[1]	Net income includes $0.66 million of income attributable to preferred unitholders that accumulated during the period, of which $0.64 million is allocated to the common unitholders and $0.01 million is allocated to the general partner.
[2]	Net income includes $1.44 million of income attributable to preferred unitholders that accumulated during the period, of which $1.41 million is allocated to the common unitholders and $0.03 million is allocated to the general partner.
[3]	Net income includes $2.15 million of income attributable to preferred unitholders that accumulated during the period, of which $2.11 million is allocated to the common unitholders and $0.04 million is allocated to the general partner.
[4]	Net income includes $2.9 million of income attributable to preferred unitholders that accumulated during the period, of which $2.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[5]	Net income includes $5.0 million of income attributable to preferred unitholders that accumulated during the period, of which $4.9 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[6]	Net income includes $6.7 million of income attributable to preferred unitholders that accumulated during the period, of which $6.5 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[7]	Amounts reclassified into income out of accumulated other comprehensive loss were $1.5 million and $0.9 million for the three months ended September 30, 2024 and 2023, respectively and $4.5 million and $(17.4) million for the nine months ended September 30, 2024 and 2023, respectively.

Note 8 - Mineral Rights, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gain (Loss) on Disposition of Assets	$ 1	$ 854	$ 4,809	$ 955
Coal Mineral Rights [Member]
Depletion	$ 4,700	4,100	12,100	11,600
Gain (Loss) on Disposition of Assets		$ 900	$ 4,800	$ 1,000

Note 8 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Mineral Properties, carrying value	$ 695,113	$ 695,408
Mineral Properties, accumulated depletion	(312,839)	(300,925)
Mineral Properties, net book value	382,274	394,483
Coal Properties [Member]
Mineral Properties, carrying value	660,961	661,256
Mineral Properties, accumulated depletion	(296,781)	(285,470)
Mineral Properties, net book value	364,180	375,786
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(4,003)	(3,761)
Mineral Properties, net book value	4,652	4,894
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,443)	(10,082)
Mineral Properties, net book value	1,911	2,272
Other [Member]
Mineral Properties, carrying value	13,143	13,143
Mineral Properties, accumulated depletion	(1,612)	(1,612)
Mineral Properties, net book value	$ 11,531	$ 11,531

Note 9 - Debt, Net (Details Textual) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
Note 9 - Debt, Net (Details Textual) $ in Thousands	Feb. 01, 2024 USD ($)	Feb. 29, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2023 USD ($)	Aug. 31, 2022 USD ($)
Nontrade Receivables, Noncurrent			$ 24,212		$ 24,212			$ 26,321
Long-Term Debt, Gross			197,678		197,678			155,525
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member]
Line of Credit Facility, Remaining Borrowing Capacity			45,300		45,300			59,200	$ 155,000	$ 130,000
Line of Credit Facility, Maximum Borrowing Capacity, Addition of Future Commitments									$ 200,000
Line of Credit Facility, Increase (Decrease), Net	$ 30,000	$ 15,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 185,000	200,000					$ 155,000
Long-Term Line of Credit			$ 154,700		154,700			95,800
Proceeds from Lines of Credit					152,900	$ 215,000
Repayments of Lines of Credit					$ 94,000	$ 157,000
Long-Term Debt, Weighted Average Interest Rate, over Time			8.91%	8.85%	8.92%	8.61%
Nontrade Receivables, Noncurrent			$ 24,200		$ 24,200			26,300
Long-Term Debt, Gross			154,684		154,684			95,834
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| Other Noncurrent Assets [Member]
Debt Instrument, Collateral Amount			$ 305,300		$ 305,300			316,300
Floating Rate Revolving Credit Facility Due August 2027 [Member] \| Opco [Member] \| New Lender [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 30,000
Debt Instrument Covenant Maximum Leverage Ratio			3		3
Leverage Ratio			0.8		0.8
Debt Instrument, Covenant, Minimum Interest Coverage Ratio			3.5		3.5
Interest Coverage Ratio			14.2		14.2
Senior Notes [Member] \| Opco [Member]
Long-Term Debt, Gross			$ 43,000		$ 43,000			$ 59,700
Repayments of Debt					$ 16,700	$ 19,100

Note 9 - Debt, Net - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt instrument, carrying value	$ 197,678	$ 155,525
Net unamortized debt issuance costs	(315)	(467)
Total debt, net	197,363	155,058
Less: current portion of long-term debt	(14,226)	(30,785)
Total long-term debt, net	183,137	124,273
Senior Notes [Member] \| Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	0	12,685
Senior Notes [Member] \| Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	0	4,012
Senior Notes [Member] \| Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	34,262	34,262
Senior Notes [Member] \| Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	8,732	8,732
Opco Senior Notes [Member]
Debt instrument, carrying value	42,994	59,691
Opco [Member] \| Floating Rate Revolving Credit Facility Due August 2027 [Member]
Debt instrument, carrying value	154,684	95,834
Opco [Member] \| Senior Notes [Member]
Debt instrument, carrying value	$ 43,000	$ 59,700

Note 9 - Debt, Net - Schedule of Long-term Debt (Details) (Parentheticals) - Senior Notes [Member]	Sep. 30, 2024	Dec. 31, 2023
Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	5.82%	5.82%
Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, interest rate	8.92%	8.92%
Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.03%	5.03%
Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, interest rate	5.18%	5.18%

Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Discount Rate	15.00%	15.00%
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 0	$ 0

Note 10 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands

Sep. 30, 2024

Dec. 31, 2023

Reported Value Measurement [Member]

Contract receivable, net (current and long-term)

^[1]

$ 26,997

$ 28,946

Estimate of Fair Value Measurement [Member]

Contract receivable, net (current and long-term)

^[1]

23,223

24,492

Opco Senior Notes [Member] | Reported Value Measurement [Member]

Opco Senior Notes [Member] | Estimate of Fair Value Measurement [Member]

^[2]

42,679

59,224

Floating Rate Revolving Credit Facility Due August 2027 [Member] | Reported Value Measurement [Member]

^[2]

40,992

56,533

Floating Rate Revolving Credit Facility Due August 2027 [Member] | Estimate of Fair Value Measurement [Member]

^[3]

154,684

95,834

Alpha Metallurgical Resources [Member]

^[3]

$ 154,684

$ 95,384

[1]	The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at September 30, 2024 and December 31, 2023.
[2]	The fair value of the Opco Senior Notes was estimated by management utilizing the present value replacement method incorporating the interest rate of the Opco Credit Facility.
[3]	The fair value of the Opco Credit Facility approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay this debt at any time without penalty.

Note 11 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Assets [Abstract]
Other Assets, Noncurrent	$ 9,187		$ 9,187		$ 7,540
Liabilities [Abstract]
Other Liabilities, Noncurrent	5,903		5,903		7,172
Accounts Payable, Current	984		984		885
Operating Costs and Expenses	6,786	$ 8,358	18,391	$ 23,451
Other Assets, Noncurrent	$ 9,187		$ 9,187		$ 7,540
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent		Other Assets, Noncurrent		Other Assets, Noncurrent
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent		Other Liabilities, Noncurrent		Other Liabilities, Noncurrent
WPPLP [Member]
Accounts Payable, Current	$ 100		$ 100		$ 100
Operating Lease, Liability	3,400		3,400		3,500
Operating Costs and Expenses	10	$ 1,100	50	$ 5,100
Operating Lease, Right-of-Use Asset	3,400		3,400		3,500
WPPLP [Member] \| Prepaid Royalty [Member]
Assets [Abstract]
Other Assets, Noncurrent	500		500		0
Other Assets, Noncurrent	500		500		0
Quintana Minerals Corp [Member] \| Affiliated Entity [Member]
Accounts Payable, Current	$ 600		$ 600		$ 600

Note 11 - Related Party Transactions - General Partner Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Costs and Expenses	$ 6,786	$ 8,358	$ 18,391	$ 23,451
QMC and WPPLP and QID [Member] \| Affiliated Entity [Member]
Operating Costs and Expenses	2,014	1,663	5,483	5,094
General and administrative expenses	$ 1,296	$ 1,287	$ 4,117	$ 3,860

Note 12 - Major Customers - Concentration Risk (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2023

Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]

^[1]

$ 14,556

$ 17,219

$ 53,345

$ 61,122

Revenue, percent

^[1]

28.00%

20.00%

30.00%

22.00%

Foresight Energy Resources [Member]

Foresight Energy Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]

^[1]

$ 7,421

$ 18,600

$ 30,003

$ 43,453

Revenue, percent

^[1]

14.00%

22.00%

17.00%

16.00%

Alabama Kanu Holdings [Member]