10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2026 or

☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
		Commission file number:	001-31465

NATURAL RESOURCE PARTNERS LP
	(Exact name of registrant as specified in its charter)

Delaware	35-2164875
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1415 Louisiana Street, Suite 3325

Houston, Texas 77002

(Address of principal executive offices)

(Zip Code)

(713) 751-7507

(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Units representing limited partner interests	NRP	New York Stock Exchange

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒   No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definition of "accelerated filer", "large accelerated filer", "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	☒	Accelerated Filer	☐
Non-accelerated Filer	☐	Smaller Reporting Company	☐
		Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PRECEDING FIVE YEARS:

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.  Yes ☐    No  ☐

APPLICABLE ONLY TO CORPORATE ISSUERS

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

NATURAL RESOURCE PARTNERS, L.P.

TABLE OF CONTENTS

		Page
Part I. Financial Information
Item 1.	Consolidated Financial Statements
	Consolidated Balance Sheets	1
	Consolidated Statements of Comprehensive Income	2
	Consolidated Statements of Partners’ Capital	3
	Consolidated Statements of Cash Flows	4
	Notes to Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	24
Item 4.	Controls and Procedures	24
Part II. Other Information
Item 1.	Legal Proceedings	25
Item 1A.	Risk Factors	25
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	25
Item 3.	Defaults Upon Senior Securities	25
Item 4.	Mine Safety Disclosures	25
Item 5.	Other Information	25
Item 6.	Exhibits	25
	Signatures	26

i

PART I. FINANCIAL INFORMATION

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED BALANCE SHEETS

	March 31,			December 31,
	2026			2025
(In thousands, except unit data)	(Unaudited)
ASSETS
Current assets
Cash and cash equivalents	$	31,504		$	30,141
Accounts receivable, net		26,792			28,666
Other current assets, net		1,425			2,105
Total current assets	$	59,721		$	60,912
Land		24,007			24,008
Mineral rights, net		360,860			366,987
Intangible assets, net		10,426			11,908
Equity in unconsolidated investment		281,477			250,244
Long-term contract receivable, net		19,598			20,406
Other long-term assets, net		15,568			13,900
Total assets	$	771,657		$	748,365
LIABILITIES AND CAPITAL
Current liabilities
Accounts payable	$	2,448		$	1,159
Accrued liabilities		4,605			10,897
Accrued interest		279			69
Current portion of deferred revenue		7,029			6,663
Current portion of debt, net		14,234			14,198
Total current liabilities	$	28,595		$	32,986
Deferred revenue		59,136			58,067
Long-term debt, net		46,084			18,884
Other non-current liabilities		5,310			5,909
Total liabilities	$	139,125		$	115,846
Commitments and contingencies (see Note 12)
Partners’ capital
Common unitholders’ interest (13,250,412 and 13,138,097 units issued and outstanding at March 31, 2026 and December 31, 2025, respectively)	$	624,902		$	625,188
General partner’s interest		11,771			11,332
Accumulated other comprehensive loss		(4,141	)		(4,001	)
Total partners’ capital	$	632,532		$	632,519
Total liabilities and partners' capital	$	771,657		$	748,365

The accompanying notes are an integral part of these consolidated financial statements.

1

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended March 31,
(In thousands, except per unit data)	2026			2025
Revenues and other income
Royalty and other mineral rights	$	43,297		$	51,260
Transportation and processing services		3,885			4,421
Equity in earnings (loss) of Sisecam Wyoming		(7,828	)		4,610
Gain (loss) on asset sales and disposals		(1	)		247
Total revenues and other income	$	39,353		$	60,538
Operating expenses
Operating and maintenance expenses	$	6,113		$	6,776
Depreciation, depletion and amortization		7,614			3,989
General and administrative expenses		5,034			6,832
Asset impairments		—			20
Total operating expenses	$	18,761		$	17,617
Income from operations	$	20,592		$	42,921
Interest expense, net	$	(973	)	$	(2,668	)
Net income	$	19,619		$	40,253
Net income attributable to common unitholders	$	19,227		$	39,448
Net income attributable to the general partner		392			805
Net income per common unit (see Note 4)
Basic	$	1.46		$	3.01
Diluted		1.44			2.97
Net income	$	19,619		$	40,253
Comprehensive income (loss) from unconsolidated investment and other		(140	)		2,260
Comprehensive income	$	19,479		$	42,513

The accompanying notes are an integral part of these consolidated financial statements.

2

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL

(Unaudited)

									Accumulated
									Other			Total
	Common Unitholders					General			Comprehensive			Partners'
(In thousands)	Units		Amounts			Partner			Loss			Capital
Balance at December 31, 2025		13,138	$	625,188		$	11,332		$	(4,001	)	$	632,519
Net income		—		19,227			392			—			19,619
Distributions to common unitholders and the general partner		—		(11,528	)		(235	)		—			(11,763	)
Issuance of unit-based awards		112		—			—			—			—
Unit-based awards amortization and vesting, net		—		(7,985	)		—			—			(7,985	)
Capital contribution		—		—			282			—			282
Comprehensive loss from unconsolidated investment and other		—		—			—			(140	)		(140	)
Balance at March 31, 2026		13,250	$	624,902		$	11,771		$	(4,141	)	$	632,532

									Accumulated
									Other			Total
	Common Unitholders					General			Comprehensive			Partners'
(In thousands)	Units		Amounts			Partner			Income (Loss)			Capital
Balance at December 31, 2024		13,049	$	543,231		$	9,547		$	(1,670	)	$	551,108
Net income		—		39,448			805			—			40,253
Distributions to common unitholders and the general partner		—		(25,750	)		(526	)		—			(26,276	)
Issuance of unit-based awards		89		—			—			—			—
Unit-based awards amortization and vesting, net		—		(3,175	)		—			—			(3,175	)
Capital contribution		—		—			187			—			187
Comprehensive income from unconsolidated investment and other		—		—			—			2,260			2,260
Balance at March 31, 2025		13,138	$	553,754		$	10,013		$	590		$	564,357

The accompanying notes are an integral part of these consolidated financial statements.

3

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Cash flows from operating activities
Net income	$	19,619		$	40,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization		7,614			3,989
Distributions from unconsolidated investment		—			2,940
Equity in (earnings) loss from unconsolidated investment		7,828			(4,610	)
Loss (gain) on asset sales and disposals		1			(247	)
Asset impairments		—			20
Bad debt expense		(776	)		451
Unit-based compensation expense		1,164			2,717
Amortization of debt issuance costs and other		447			(168	)
Change in operating assets and liabilities:
Accounts receivable		615			(149	)
Accounts payable		1,290			546
Accrued liabilities		(7,156	)		(7,990	)
Accrued interest		210			254
Deferred revenue		1,434			(3,227	)
Other items, net		724			(355	)
Net cash provided by operating activities	$	33,014		$	34,424
Cash flows from investing activities
Proceeds from asset sales and disposals	$	—		$	247
Capital to unconsolidated investment		(39,200	)		—
Return of long-term contract receivable		758			700
Net cash provided by (used in) investing activities	$	(38,442	)	$	947
Cash flows from financing activities
Debt borrowings	$	61,200		$	33,700
Debt repayments		(34,000	)		(37,000	)
Distributions to common unitholders and the general partner		(11,763	)		(26,276	)
Other items, net		(8,646	)		(5,363	)
Net cash provided by (used in) financing activities	$	6,791		$	(34,939	)
Net increase in cash and cash equivalents	$	1,363		$	432
Cash and cash equivalents at beginning of period		30,141			30,444
Cash and cash equivalents at end of period	$	31,504		$	30,876
Supplemental cash flow information:
Cash paid for interest	$	684		$	2,371

The accompanying notes are an integral part of these consolidated financial statements.

4

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.    Basis of Presentation

Nature of Business

Natural Resource Partners L.P. (the "Partnership") engages principally in the business of owning, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal and other natural resources and owns a non-controlling 49% interest in Sisecam Wyoming LLC ("Sisecam Wyoming"), a trona ore mining and soda ash production business. The Partnership is organized into two operating segments further described in Note 5. Segment Information. The Partnership’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Partnership owns its subsidiaries through one wholly owned operating company, NRP (Operating) LLC ("Opco"). As used in these Notes to Consolidated Financial Statements, the terms "NRP," "we," "us" and "our" refer to Natural Resource Partners L.P. and its subsidiaries, unless otherwise stated or indicated by context.

Principles of Consolidation and Reporting

The accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the financial statements for the year ended December 31, 2025, and notes thereto included in the Partnership's Annual Report on Form 10-K, which was filed with the SEC on February 27, 2026. 

Recently Issued Accounting Standard

In  November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures ("ASU 2024-03"). ASU 2024-03 is intended to improve disclosures about a public business entity's expenses and provide more detailed information to investors about the types of expenses in commonly presented expense captions. The guidance is effective for annual periods beginning after  December 15, 2026, and quarterly periods beginning after  December 31, 2027, and can be adopted prospectively to financial statements issued for reporting periods after the effective date or retrospectively to all prior periods presented in the financial statements. NRP does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements.

5

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

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 March 31,
(In thousands)	2026		2025
Coal royalty revenues	$	29,574	$	35,498
Production lease minimum revenues		558		2,725
Minimum lease straight-line revenues		4,019		4,050
Oil and gas royalty revenues		1,386		2,444
Carbon neutral revenues		185		595
Property tax revenues		1,711		1,637
Wheelage revenues		1,990		1,738
Coal overriding royalty revenues		1,386		880
Lease amendment revenues		1,200		655
Aggregates royalty revenues		1,118		853
Other revenues		170		185
Royalty and other mineral rights revenues	$	43,297	$	51,260
Transportation and processing services revenues		3,408		3,885
Total Mineral Rights segment revenues from contracts with customers	$	46,705	$	55,145

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

	March 31,		December 31,
(In thousands)	2026		2025
Contract assets
Accounts receivable, net	$	22,422	$	24,372
Other current assets, net		—		84
Other long-term assets, net		7,234		5,281
Contract liabilities
Accounts payable	$	125	$	211
Current portion of deferred revenue		7,029		6,663
Deferred revenue		59,136		58,067

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

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Balance at beginning of period (current and non-current)	$	64,730		$	60,155
Increase due to minimums and lease amendment fees		10,942			5,861
Recognition of previously deferred revenue		(9,507	)		(9,088	)
Balance at end of period (current and non-current)	$	66,165		$	56,928

The Partnership's non-cancellable annual minimum payments due under the lease terms of its coal and aggregates royalty contracts with customers are as follows as of  March 31, 2026 (in thousands): 

Lease Term (1)	Weighted Average Remaining Years		Annual Minimum Payments
0 - 5 years		2.1	$	13,269
5 - 10 years		6.2		15,493
10+ years		10.0		26,309
Total		7.0	$	55,071

⁽¹⁾ Lease term does not include renewal periods.

6

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

3.    Common Unit Distributions

The Partnership makes cash distributions to common unitholders on a quarterly basis, subject to approval by the Board of Directors of GP Natural Resource Partners LLC (the "Board of Directors"). NRP recognizes common unit distributions on the date the distribution is declared.

Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions.

The following table shows the cash distributions declared and paid to common unitholders during the three months ended March 31, 2026 and 2025, respectively:

Month Paid	Period Covered by Distribution	Distribution per Unit		Total Distribution (1) (In thousands)
2026
February	October 1 - December 31, 2025	$	0.75	$	10,141
March (2)	Special Distribution		0.12		1,622
2025
February	October 1 - December 31, 2024	$	0.75	$	10,055
March (3)	Special Distribution		1.21		16,221

(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 2025.
(3)	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2024.

4.    Net Income Per Common Unit 

Basic net income per common unit is computed by dividing net income, after considering the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's unvested unit-based awards if the inclusion of these items is dilutive.

The dilutive effect of the unvested unit-based awards is calculated using the treasury stock method, which assumes that the proceeds from the vesting of the unvested unit-based awards are used to purchase common units at the average market price for the period. The calculation of diluted net income per common unit for the three months ended March 31, 2026 and 2025 included the impact of the vesting of the unvested unit-based awards.

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 March 31,
(In thousands, except per unit data)	2026			2025
Basic net income per common unit
Net income attributable to common unitholders	$	19,227		$	39,448
Weighted average common units—basic		13,199			13,098
Basic net income per common unit	$	1.46		$	3.01
Diluted net income per common unit
Weighted average common units—basic		13,199			13,098
Plus: dilutive effect of unvested unit-based awards		151			206
Weighted average common units—diluted		13,350			13,304
Diluted net income attributable to common unitholders and the general partner	$	19,619		$	40,253
Less: diluted net income attributable to the general partner		(392	)		(805	)
Diluted net income attributable to common unitholders	$	19,227		$	39,448
Diluted net income per common unit	$	1.44		$	2.97

7

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

5.    Segment Information 

The Partnership's segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. and that are managed accordingly. NRP has the following two operating segments:

Mineral Rights—consists of mineral interests and other subsurface rights across the United States. NRP's ownership provides critical inputs for the manufacturing of steel, electricity, and basic building materials, as well as opportunities for carbon sequestration and renewable energy.

Soda Ash—consists of the Partnership's 49% non-controlling equity interest in Sisecam Wyoming, one of the world's lowest-cost producers of soda ash, an essential ingredient for the manufacturing of glass, detergents, solar panels, and batteries for electric vehicles. Operations are managed by NRP's partner, Sisecam Chemicals Wyoming, LLC, and NRP realizes cash flow when distributions are paid to it.

Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include salaries and benefits, insurance, property taxes, legal, royalty, information technology and shared facilities services and are included in operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income.

Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include interest and financing, corporate headquarters and overhead, centralized treasury, legal and accounting and other corporate-level activity not specifically allocated to a segment and are included in general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income.

NRP’s Chief Operating Decision Makers (“CODMs”) are its Chief Executive Officer and President and Chief Operating Officer. They evaluate the Partnership’s performance through a review of the segments’ net income and free cash flow as compared to budget and utilize this information to assess the segments’ performance and allocate resources. NRP does not conduct operations on any of its assets or directly engage in any type of industrial activity. Instead, it leases its mineral and other rights to companies that conduct operations on its properties in exchange for paying royalties and other fees to the Partnership. Operating expenses, capital costs and other liabilities arising out of production activities are borne entirely by NRP's lessees. In the case of its soda ash investment, operations are managed by NRP's partner, Sisecam Chemicals Wyoming LLC. NRP has determined its significant segment expenses to be its employee related expenses, including compensation (salaries, benefits and bonus) and long-term incentive compensation as well as interest expense and property tax expense. The Partnership is responsible for paying property taxes on the properties it owns. Typically, NRP's lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties and this reimbursement amount is included within the Mineral Rights segment revenues.

8

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

The following tables summarize certain financial information for each of the Partnership's business segments:

	Operating Segments
(In thousands)	Mineral Rights			Soda Ash			Total Operating Segments			Corporate and Financing			Total
For the Three Months Ended March 31, 2026
Revenues	$	47,182		$	—		$	47,182		$	—		$	47,182
Equity in earnings of Sisecam Wyoming		—			(7,828	)		(7,828	)		—			(7,828	)
Gain on asset sales and disposals		(1	)		—			(1	)		—			(1	)
Total revenues and other income	$	47,181		$	(7,828	)	$	39,353		$	—		$	39,353
Less:
Compensation (salaries, benefits and bonus)	$	1,797		$	—		$	1,797		$	2,064		$	3,861
Long-term incentive compensation (1)		262			—			262			907			1,169
Property taxes		1,879			—			1,879			—			1,879
Depreciation, depletion and amortization		7,610			—			7,610			4			7,614
Asset impairments		—			—			—			—			—
Interest expense, net (2)		—			—			—			973			973
Other segment items (3)		2,103			72			2,175			2,063			4,238
Net income (loss)	$	33,530		$	(7,900	)	$	25,630		$	(6,011	)	$	19,619
As of March 31, 2026
Total assets	$	484,989		$	281,477		$	766,466		$	5,191		$	771,657
For the Three Months Ended March 31, 2025
Revenues	$	55,681		$	—		$	55,681		$	—		$	55,681
Equity in earnings of Sisecam Wyoming		—			4,610			4,610			—			4,610
Gain on asset sales and disposals		247			—			247			—			247
Total revenues and other income	$	55,928		$	4,610		$	60,538		$	—		$	60,538
Less:
Compensation (salaries, benefits and bonus)	$	1,938		$	—		$	1,938		$	2,109		$	4,047
Long-term incentive compensation (4)		464			—			464			2,261			2,725
Property taxes		1,792			—			1,792			—			1,792
Depreciation, depletion and amortization		3,985			—			3,985			4			3,989
Asset impairments		20			—			20			—			20
Interest expense, net (2)		—			—			—			2,668			2,668
Other segment items (3)		2,521			60			2,581			2,463			5,044
Net income (loss)	$	45,208		$	4,550		$	49,758		$	(9,505	)	$	40,253
As of December 31, 2025
Total assets	$	492,672		$	250,244		$	742,916		$	5,449		$	748,365

⁽¹⁾ Long-term incentive compensation for the three months ended March 31, 2026 includes (1) Mineral Rights segment: $0.1 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $0.8 million of equity compensation and $0.1 million of cash compensation.

⁽²⁾ Included in interest expense, net was $0.2 million of interest income for both the three months ended March 31, 2026 and 2025. 

(3)

Other segment items in the Mineral Rights segment primarily include: insurance, legal, overriding royalty expense, processing and transportation expense, information technology, shared facility services, rent, professional fees and bad debt expense. Other segment items in the Soda Ash segment primarily include professional fees. Other segment items in the Corporate and Financing segment primarily include: insurance, legal, information technology, shared facility services, rent and professional fees.

(4)

Long-term incentive compensation for the three months ended March 31, 2025 includes (1) Mineral Rights segment: $0.3 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $2.2 million of equity compensation and $0.1 million of cash compensation.

9

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

6.    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 March 31,
(In thousands)	2026			2025
Balance at beginning of period	$	250,244		$	257,355
Income (loss) allocation to NRP’s equity interests (1)		(6,697	)		5,764
Amortization of basis difference		(1,130	)		(1,153	)
Capital investment		39,200			—
Other comprehensive income (loss)		(140	)		2,260
Distributions		—			(2,940	)
Balance at end of period	$	281,477		$	261,286

⁽¹⁾ Amounts reclassified into income (loss) out of accumulated other comprehensive loss were $1.6 million and $1.3 million for the three months ended March 31, 2026 and 2025, respectively.

During the three months ended March 31, 2026, NRP and Sisecam Wyoming's managing partner made a capital investment into Sisecam Wyoming ($39.2 million for NRP's 49%) to reduce outstanding amounts under Sisecam Wyoming's bank credit facility.

The following table represents summarized financial information for Sisecam Wyoming as derived from their respective unaudited financial statements for the three months ended March 31, 2026 and 2025:

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Net sales	$	127,335		$	153,309
Gross profit (loss)		(4,731	)		19,033
Net income (loss)		(13,667	)		11,764

7.    Mineral Rights, Net 

The Partnership’s mineral rights consist of the following:

	March 31, 2026							December 31, 2025
(In thousands)	Carrying Value		Accumulated Depletion			Net Book Value		Carrying Value		Accumulated Depletion			Net Book Value
Coal properties	$	653,808	$	(310,427	)	$	343,381	$	653,808	$	(304,412	)	$	349,396
Aggregates properties		8,655		(4,439	)		4,216		8,655		(4,364	)		4,291
Oil and gas royalty properties		12,354		(10,621	)		1,733		12,354		(10,584	)		1,770
Other		13,142		(1,612	)		11,530		13,142		(1,612	)		11,530
Total mineral rights, net	$	687,959	$	(327,099	)	$	360,860	$	687,959	$	(320,972	)	$	366,987

Depletion expense related to the Partnership’s mineral rights is included in depreciation, depletion and amortization on its Consolidated Statements of Comprehensive Income and totaled $6.1 million and $3.7 million for the three months ended March 31, 2026 and 2025, respectively.

The Partnership has developed procedures to evaluate its long-lived assets for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not be recoverable. Potential events or circumstances include, but are not limited to, specific events such as a reduction in economically recoverable minerals or production ceasing on a property for an extended period. This analysis is based on historic, current and future performance and considers both quantitative and qualitative information. As a result of the Partnership's analysis, NRP recorded an immaterial impairment expense during the three months ended March 31, 2025.

10

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

8.    Debt, Net

The Partnership's debt consists of the following:

	March 31,			December 31,
(In thousands)	2026			2025
Opco Credit Facility	$	46,084		$	18,884
Opco Senior Notes
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026	$	11,420		$	11,420
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		2,911			2,911
Total Opco Senior Notes	$	14,331		$	14,331
Total debt at face value	$	60,415		$	33,215
Net unamortized debt issuance costs		(97	)		(133	)
Total debt, net	$	60,318		$	33,082
Less: current portion of debt		(14,234	)		(14,198	)
Total long-term debt, net	$	46,084		$	18,884

Opco Debt

All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries, other than BRP LLC and NRP Trona LLC. As of March 31, 2026 and December 31, 2025, Opco was in compliance with the terms of the financial covenants contained in its debt agreements.

Opco Credit Facility

As of December 31, 2025, the Partnership had $18.9 million in borrowings outstanding under the Opco Credit Facility and $181.1 million of available borrowing capacity. During the three months ended March 31, 2026, the Partnership borrowed $61.2 million and repaid $34.0 million, resulting in $46.1 million in borrowings outstanding under the Opco Credit Facility and $153.9 million of available borrowing capacity as of March 31, 2026. During the three months ended March 31, 2025, the Partnership borrowed $33.7 million and repaid $37.0 million on the Opco Credit Facility. The weighted average interest rate for the borrowings outstanding under the Opco Credit Facility for the three months ended March 31, 2026 and 2025 were 7.28% and 7.93%, respectively.

The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values of $284.8 million and $290.6 million classified as mineral rights, net and other long-term assets, net and $19.6 million and $20.4 million classified as long-term contract receivable, net on the Partnership’s Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025, respectively.

The Opco Credit Facility contains financial covenants requiring Opco to maintain:

• 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 March 31, 2026, this ratio was 0.4x; and

• an interest coverage ratio of consolidated EBITDDA to the sum of consolidated interest expense and consolidated lease expense (in each case as defined in the Opco Credit Facility) of not less than 3.5 to 1.0. As of March 31, 2026, this ratio was 21.4x.

Opco Senior Notes   

Opco issued several series of private placement senior notes (the "Opco Senior Notes") with various interest rates and principal due dates. As of March 31, 2026, the 5.03% and 5.18% Opco Senior Notes remain outstanding. These Opco Senior Notes have principal due annually in December and interest due semi-annually in June and December. As of both  March 31, 2026 and December 31, 2025, the Opco Senior Notes had cumulative principal balances of $14.3 million. These Opco Senior Notes will fully mature in December 2026.

11

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

9.    Fair Value Measurements 

Fair Value of Financial Assets and Liabilities

The Partnership’s financial assets and liabilities consist of cash and cash equivalents, accounts receivables, a contract receivable, accounts payables and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents, accounts receivables and accounts payables approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its contract receivable and debt.

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

			March 31, 2026				December 31, 2025
	Fair Value		Carrying		Estimated		Carrying		Estimated
(In thousands)	Hierarchy Level		Value		Fair Value		Value		Fair Value
Assets:
Contract receivable, net (current and long-term) (1)		3	$	22,734	$	20,233	$	23,480	$	20,792
Debt:
Opco Senior Notes (2)		3	$	14,234	$	14,025	$	14,198	$	14,018
Opco Credit Facility (3)		3		46,084		46,084		18,884		18,884

(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 March 31, 2026 and December 31, 2025.
(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 the debt at any time without penalty.

10.    Related Party Transactions 

Affiliates of our General Partner

The Partnership’s general partner does not receive any management fee or other compensation for its management of NRP. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for services provided to the Partnership and for expenses incurred on the Partnership’s behalf. Employees of Quintana Minerals Corporation ("QMC") and Western Pocahontas Properties Limited Partnership ("WPPLP"), affiliates of the Partnership, provide their services to manage the Partnership's business. QMC and WPPLP charge the Partnership the portion of their employee salary and benefits costs related to their employee services provided to NRP. These QMC and WPPLP employee management service costs are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income. NRP also reimburses overhead costs incurred by its affiliates, and other related parties, to manage the Partnership's business. These overhead costs include certain rent, information technology, administration of employee benefits and other corporate services incurred by or on behalf of the Partnership’s general partner and its affiliates and are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income.

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

	For the Three Months Ended March 31,
(In thousands)	2026		2025
Operating and maintenance expenses	$	1,622	$	1,793
General and administrative expenses		1,566		1,569

The Partnership had accounts payable to related parties of $0.6 million and $0.7 million on its Consolidated Balance Sheets as of  March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026 and December 31, 2025, the Partnership had $0.1 million and $0.2 million, respectively, of prepaid expenses included in other current assets, net on its Consolidated Balance Sheets.

As a result of its office lease with WPPLP, the Partnership has a right-of-use asset and lease liability of $3.4 million included in other long-term assets, net and other non-current liabilities, respectively on its Consolidated Balance Sheets at both  March 31, 2026 and December 31, 2025.

During the three months ended March 31, 2026 and 2025, the Partnership recognized $1.2 million and $0.1 million, respectively, in operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to an overriding royalty agreement with WPPLP. The Partnership also had $1.2 million and $0.1 million in accounts payable on its Consolidated Balance Sheets as of  March 31, 2026 and December 31, 2025, respectively, related to this agreement. As of both March 31, 2026 and December 31, 2025, the Partnership had $1.1 million of other long-term assets, net on its Consolidated Balance Sheets related to a prepaid royalty for this agreement. 

12

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

11.    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 March 31,
	2026					2025
(In thousands)	Revenues		Percent			Revenues		Percent
Alpha Metallurgical Resources, Inc. (1)	$	13,701		29	%	$	13,176		24	%
Foresight Energy Resources LLC ("Foresight") (1)	$	13,497		29	%	$	16,460		30	%
Alabama Kanu Holdings, LLC (1)	$	4,730		10	%	$	3,258		6	%

⁽¹⁾ Revenues from Alpha Metallurgical Resources, Inc., Foresight, and Alabama Kanu Holdings, LLC are generated in the United States of America and are included within the Partnership's Mineral Rights segment.

12.    Commitments and Contingencies

NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these ordinary course matters will not have a material effect on the Partnership’s financial position, liquidity or operations as of and for the three months ended March 31, 2026.

13.    Unit-Based Compensation 

During the three months ended March 31, 2026 and 2025, the Partnership granted service, performance and market-based awards under its 2017 Long-Term Incentive Plan. The Partnership's service and performance-based awards are valued using the closing price of NRP's common units as of the grant date while the Partnership's market-based awards are valued using a Monte Carlo simulation. The grant date fair value of the awards granted during the three months ended March 31, 2026 and 2025 was $8.6 million and $6.8 million, respectively, which included a grant date fair value of $3.1 million and $2.5 million for the market-based awards valued using a Monte Carlo simulation during the three months ended March 31, 2026 and 2025, respectively. Total unit-based compensation expense associated with service, performance and market-based awards was $1.2 million and $2.7 million for the three months ended March 31, 2026 and 2025, respectively, and is included in general and administrative expenses and operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. The unamortized cost associated with unvested outstanding awards as of March 31, 2026 was $11.9 million, which will be recognized over a weighted average period of 2.3 years. The unamortized cost associated with unvested outstanding awards as of  December 31, 2025 was $5.9 million. The Partnership paid $8.9 million and $5.5 million in cash during the three months ended  March 31, 2026 and 2025, respectively, for taxes on the unit-based award settlements during the respective years. These cash payments are included in other items, net under cash flows from financing activities on the Partnership's Consolidated Statements of Cash Flows. 

A summary of the unit activity in the outstanding grants during 2026 is as follows:

(In thousands)	Common Units			Weighted Average Grant Date Fair Value per Common Unit
Outstanding at January 1, 2026		266		$	78.68
Granted		65		$	132.29
Fully vested and issued		(155	)	$	65.19
Outstanding at March 31, 2026		176		$	110.54

13

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

 

14.    Credit Losses 

The Partnership is exposed to credit losses through collection of its short-term trade receivables resulting from contracts with customers and a long-term receivable resulting from a financing transaction with a customer. The Partnership records an allowance for current expected credit losses on these receivables based on the loss-rate method. NRP assessed the likelihood of collection of its receivables utilizing historical loss rates, current market conditions, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. Examples of these facts or circumstances include, but are not limited to, contract disputes or renegotiations with the customer and evaluation of short and long-term economic viability of the contracted property. For its long-term contract receivable, management reverts to the historical loss experience immediately after the reasonable and supportable forecast period ends.

As of March 31, 2026 and December 31, 2025, NRP had the following current expected credit loss (“CECL”) allowance related to its receivables and long-term contract receivable:

	March 31, 2026							December 31, 2025
(In thousands)	Gross		CECL Allowance			Net		Gross		CECL Allowance			Net
Receivables	$	35,431	$	(3,565	)	$	31,866	$	36,178	$	(4,183	)	$	31,995
Long-term contract receivable		20,301		(703	)		19,598		21,138		(732	)		20,406
Total	$	55,732	$	(4,268	)	$	51,464	$	57,316	$	(4,915	)	$	52,401

NRP recorded reversals of $0.6 million and $0.3 million of operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to the change in the CECL allowance during the three months ended March 31, 2026 and 2025, respectively.

NRP has procedures in place to monitor its ongoing credit exposure through timely review of counterparty balances against contract terms and due dates, account and financing receivable reconciliation, bankruptcy monitoring, lessee audits and dispute resolution. The Partnership may employ legal counsel or collection specialists to pursue recovery of defaulted receivables.

15.    Subsequent Events

The following represents material events that occurred after  March 31, 2026 through the time of the Partnership’s filing of its Quarterly Report on Form 10-Q with the SEC:

Common Unit Distributions

In May 2026, the Board of Directors declared a distribution of $0.75 per common unit with respect to the first quarter of 2026. 

14

 

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following review of operations for the three month periods ended March 31, 2026 and 2025 should be read in conjunction with our Consolidated Financial Statements and the Notes to Consolidated Financial Statements included in this Form 10-Q and with the Consolidated Financial Statements, Notes to Consolidated Financial Statements and Management’s Discussion and Analysis included in the Natural Resource Partners L.P. Annual Report on Form 10-K for the year ended December 31, 2025.

As used herein, unless the context otherwise requires: "we," "our," "us" and the "Partnership" refer to Natural Resource Partners L.P. and, where the context requires, our subsidiaries. References to "NRP" and "Natural Resource Partners" refer to Natural Resource Partners L.P. only, and not to NRP (Operating) LLC or any of Natural Resource Partners L.P.’s subsidiaries. References to "Opco" refer to NRP (Operating) LLC, a wholly owned subsidiary of NRP, and its subsidiaries.

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

Statements included in this 10-Q may constitute forward-looking statements. In addition, we and our representatives may from time to time make other oral or written statements which are also forward-looking statements. Such forward-looking statements include, among other things, statements regarding: future distributions on our common units; our business strategy; our liquidity and access to capital and financing sources; our financial strategy; prices of and demand for coal, trona and soda ash, and other natural resources; estimated revenues, expenses and results of operations; projected future performance by our lessees; Sisecam Wyoming LLC’s ("Sisecam Wyoming's") trona mining and soda ash refinery operations; distributions from our soda ash business; the impact of governmental policies, laws and regulations, as well as regulatory and legal proceedings involving us, and of scheduled or potential regulatory or legal changes; and global and U.S. economic conditions.

These forward-looking statements speak only as of the date hereof and are made based upon our current plans, expectations, estimates, assumptions and beliefs concerning future events impacting us and involve a number of risks and uncertainties. We caution that forward-looking statements are not guarantees and that actual results could differ materially from those expressed or implied in the forward-looking statements. You should not put undue reliance on any forward-looking statements. See "Item 1A. Risk Factors" included in this Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2025 for important factors that could cause our actual results of operations or our actual financial condition to differ.

NON-GAAP FINANCIAL MEASURES

Adjusted EBITDA

Adjusted EBITDA is a non-GAAP financial measure that we define as net income (loss) less equity in earnings from unconsolidated investment; plus total distributions from unconsolidated investment, interest expense, net, debt modification expense, loss on extinguishment of debt, depreciation, depletion and amortization and asset impairments. Adjusted EBITDA should not be considered an alternative to, or more meaningful than, net income or loss, net income or loss attributable to partners, operating income or loss, cash flows from operating activities or any other measure of financial performance presented in accordance with GAAP as measures of operating performance, liquidity or ability to service debt obligations. There are significant limitations to using Adjusted EBITDA as a measure of performance, including the inability to analyze the effect of certain recurring items that materially affect our net income, the lack of comparability of results of operations of different companies and the different methods of calculating Adjusted EBITDA reported by different companies. In addition, Adjusted EBITDA presented below is not calculated or presented on the same basis as Consolidated EBITDA as defined in our partnership agreement or Consolidated EBITDDA as defined in Opco's debt agreements. For a description of Opco's debt agreements, see Note 8. Debt, Net in the Notes to Consolidated Financial Statements included herein as well as in "Item 8. Financial Statements and Supplementary Data—Note 11. Debt, Net" in our Annual Report on Form 10-K for the year ended December 31, 2025. Adjusted EBITDA is a supplemental performance measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess the financial performance of our assets without regard to financing methods, capital structure or historical cost basis.

Distributable Cash Flow

Distributable cash flow ("DCF") represents net cash provided by (used in) operating activities plus distributions from unconsolidated investment in excess of cumulative earnings, proceeds from asset sales and disposals, including sales of discontinued operations, and return of long-term contract receivable; less maintenance capital expenditures and capital to unconsolidated investment. DCF is not a measure of financial performance under GAAP and should not be considered as an alternative to cash flows from operating, investing or financing activities. DCF may not be calculated the same for us as for other companies. In addition, DCF presented below is not calculated or presented on the same basis as distributable cash flow as defined in our partnership agreement, which is used as a metric to determine whether we are able to increase quarterly distributions to our common unitholders. DCF is a supplemental liquidity measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess our ability to make cash distributions and repay debt.

Free Cash Flow

Free cash flow ("FCF") represents net cash provided by (used in) operating activities plus distributions from unconsolidated investment in excess of cumulative earnings and return of long-term contract receivable; less maintenance and expansion capital expenditures, cash flow used in acquisition costs classified as investing or financing activities and capital to unconsolidated investment. FCF is calculated before mandatory debt repayments. FCF is not a measure of financial performance under GAAP and should not be considered as an alternative to cash flows from operating, investing or financing activities. FCF may not be calculated the same for us as for other companies. FCF is a supplemental liquidity measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess our ability to make cash distributions and repay debt.

Leverage Ratio

Leverage ratio represents the outstanding principal of our debt at the end of the period divided by the last twelve months' Adjusted EBITDA as defined above. We believe that leverage ratio is a useful measure to management and investors to evaluate and monitor our indebtedness relative to our ability to generate income to service such debt and in understanding trends in our overall financial condition. Leverage ratio may not be calculated the same for us as for other companies and is not a substitute for, and should not be used in conjunction with, GAAP financial ratios. 

15

Introduction

The following discussion and analysis present management's view of our business, financial condition and overall performance. Our discussion and analysis consist of the following subjects:

•    Executive Overview

•    Results of Operations

•    Liquidity and Capital Resources

•    Off-Balance Sheet Transactions

•    Related Party Transactions

•    Summary of Critical Accounting Estimates

•    Recent Accounting Standards

Executive Overview

We are a diversified natural resource company engaged principally in the business of owning, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal and other natural resources and own a non-controlling 49% interest in Sisecam Wyoming, a trona ore mining and soda ash production business. Our common units trade on the New York Stock Exchange under the symbol "NRP." Our business is organized into two operating segments:

Mineral Rights—consists of approximately 13 million acres of mineral interests and other subsurface rights across the United States. If combined in a single tract, our ownership would cover roughly 20,000 square miles. Our assets provide critical inputs for the manufacturing of steel, electricity and building materials as well as opportunities for carbon sequestration and renewable energy. 

Soda Ash—consists of our 49% non-controlling equity interest in Sisecam Wyoming, one of the world's lowest-cost producers of soda ash, an essential ingredient for the manufacturing of glass, solar panels, detergents, and batteries for electric vehicles. Operations are managed by our partner, Sisecam Chemicals Wyoming LLC, and we realize cash flow when distributions are paid to us. 

Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include interest and financing, corporate headquarters and overhead, centralized treasury, legal and accounting and other corporate-level activity not specifically allocated to a segment.

Our financial results by segment for the three months ended March 31, 2026 are as follows:

	Operating Segments
(In thousands)	Mineral Rights			Soda Ash			Corporate and Financing			Total
Revenues and other income	$	47,181		$	(7,828	)	$	—		$	39,353
Net income (loss)	$	33,530		$	(7,900	)	$	(6,011	)	$	19,619
Adjusted EBITDA (1)	$	41,140		$	(72	)	$	(5,034	)	$	36,034
Cash flow provided by (used in) continuing operations
Operating activities	$	41,827		$	(72	)	$	(8,741	)	$	33,014
Investing activities	$	758		$	(39,200	)	$	—		$	(38,442	)
Financing activities	$	(1,256	)	$	—		$	8,047		$	6,791
Distributable cash flow (1)	$	42,585		$	(39,272	)	$	(8,741	)	$	(5,428	)
Free cash flow (1)	$	42,585		$	(39,272	)	$	(8,741	)	$	(5,428	)

⁽¹⁾ See "Results of Operations" below for reconciliations to the most comparable GAAP financial measures.

16

Current Results/Market Commentary

Financial Results and Quarterly Distributions 

We generated $33.0 million of operating cash flow and ($5.4 million) of free cash flow during the three months ended March 31, 2026, and ended the quarter with $185.4 million of liquidity consisting of $31.5 million of cash and cash equivalents and $153.9 million of available borrowing capacity under our Opco Credit Facility. As of March 31, 2026 our leverage ratio was 0.4 x.

In February 2026, we paid a cash distribution of $0.75 per common unit of NRP with respect to the fourth quarter of 2025. In March 2026, we paid a special cash distribution of $0.12 per common unit of NRP to help cover unitholder tax liabilities associated with owning NRP's common units in 2025. Future distributions on our common units will be determined on a quarterly basis by the Board of Directors. The Board of Directors considers numerous factors each quarter in determining cash distributions, including profitability, cash flow, debt service obligations, market conditions and outlook, estimated unitholder income tax liability and the level of cash reserves that the Board of Directors determines is necessary for future operating and capital needs. 

Mineral Rights Business Segment

Revenues and other income during the three months ended March 31, 2026 decreased $8.7 million, or 16%, as compared to the prior year period primarily due to lower metallurgical and thermal coal sales volumes as compared to the prior year period. Cash provided by operating activities and free cash flow during the three months ended March 31, 2026 decreased by $1.4 million and $1.3 million, respectively, as compared to the prior year period primarily due to lower metallurgical and thermal coal sales volumes, partially offset by higher recoupments in the first quarter of 2025.

Mineral Rights segment results continue to be affected by weak global steel demand, low natural gas prices, and ample coal stockpiles at power plants.

We have no meaningful developments to report on our carbon neutral initiatives, but continue to explore and make small-scale progress on opportunities to create value through carbon sequestration and renewable energy production across our vast portfolio of mineral and surface assets. 

Soda Ash Business Segment

Revenues and other income during the three months ended March 31, 2026 decreased $12.4 million, or 270%, as compared to the prior year period primarily due to lower sales prices in 2026.

Cash provided by operating activities during the three months ended March 31, 2026 decreased $3.0 million as compared to the prior year period due primarily due to the $2.9 million distribution received from Sisecam Wyoming in the first quarter of 2025 and no distribution received in the first quarter of 2026. Free cash flow decreased $42.2 million as compared to the prior year quarter primarily due to our $39.2 million capital investment made to Sisecam Wyoming in the first quarter of 2026 in addition to the $2.9 million distribution received in the first quarter of 2025. Together with our managing partner, we made a capital investment into Sisecam Wyoming in the first quarter of 2026 to reduce outstanding amounts under its bank credit facility and better position it to compete in the current environment. Sisecam Wyoming’s managing partner also invested its pro-rata share of $40.8 million. We evaluated this investment as we would any other capital allocation opportunity, with the goal of maximizing NRP's intrinsic value per unit. 

The soda ash market remains significantly oversupplied due to the influx of natural soda ash supply from China coupled with weak demand for flat glass. We believe international soda ash prices are below the cost of production for most producers with no near-term market correction in sight. Due to the weak pricing environment, we have not received a distribution from Sisecam Wyoming since the second quarter of 2025 and do not expect to receive distributions until soda ash demand increases and/or capacity is rationalized, which could take several years.

17

Results of Operations 

First Quarter of 2026 and 2025 Compared

Revenues and Other Income

The following table includes our revenues and other income by operating segment:

		For the Three Months Ended March 31,							Percentage
Operating Segment (In thousands)	2026			2025		Decrease			Change
Mineral Rights	$	47,181		$	55,928	$	(8,747	)		(16	)%
Soda Ash		(7,828	)		4,610		(12,438	)		(270	)%
Total	$	39,353		$	60,538	$	(21,185	)		(35	)%

The changes in revenues and other income are discussed for each of the operating segments below:

18

Mineral Rights

The following table presents coal sales volumes, coal royalty revenue per ton and coal royalty revenues by major coal producing region, the significant categories of other revenues and other income:

	For the Three Months Ended March 31,						Increase			Percentage
(In thousands, except per ton data)	2026			2025			(Decrease)			Change
Coal sales volumes (tons)
Appalachia
Northern		472			124			348			281	%
Central		2,967			3,306			(339	)		(10	)%
Southern		329			296			33			11	%
Total Appalachia		3,768			3,726			42			1	%
Illinois Basin		2,420			3,342			(922	)		(28	)%
Northern Powder River Basin		175			916			(741	)		(81	)%
Gulf Coast		162			237			(75	)		(32	)%
Total coal sales volumes		6,525			8,221			(1,696	)		(21	)%
Coal royalty revenue per ton
Appalachia
Northern	$	1.42		$	1.48		$	(0.06	)		(4	)%
Central		6.18			6.18			—			—	%
Southern		11.40			9.18			2.22			24	%
Illinois Basin		2.32			2.44			(0.12	)		(5	)%
Northern Powder River Basin		6.19			4.55			1.64			36	%
Gulf Coast		0.83			0.78			0.05			6	%
Combined average coal royalty revenue per ton		4.53			4.36			0.17			4	%
Coal royalty revenues
Appalachia
Northern	$	671		$	183		$	488			267	%
Central		18,328			20,426			(2,098	)		(10	)%
Southern		3,750			2,718			1,032			38	%
Total Appalachia		22,749			23,327			(578	)		(2	)%
Illinois Basin		5,606			8,141			(2,535	)		(31	)%
Northern Powder River Basin		1,084			4,169			(3,085	)		(74	)%
Gulf Coast		135			184			(49	)		(27	)%
Unadjusted coal royalty revenues		29,574			35,821			(6,247	)		(17	)%
Coal royalty adjustment for minimum leases		—			(323	)		323			100	%
Total coal royalty revenues	$	29,574		$	35,498		$	(5,924	)		(17	)%
Other revenues
Production lease minimum revenues	$	558		$	2,725		$	(2,167	)		(80	)%
Minimum lease straight-line revenues		4,019			4,050			(31	)		(1	)%
Oil and gas royalty revenues		1,386			2,444			(1,058	)		(43	)%
Carbon neutral revenues		185			595			(410	)		(69	)%
Property tax revenues		1,711			1,637			74			5	%
Wheelage revenues		1,990			1,738			252			14	%
Coal overriding royalty revenues		1,386			880			506			58	%
Lease amendment revenues		1,200			655			545			83	%
Aggregates royalty revenues		1,118			853			265			31	%
Other revenues		170			185			(15	)		(8	)%
Total other revenues	$	13,723		$	15,762		$	(2,039	)		(13	)%
Royalty and other mineral rights	$	43,297		$	51,260		$	(7,963	)		(16	)%
Transportation and processing services revenues		3,885			4,421			(536	)		(12	)%
Gain (loss) on asset sales and disposals		(1	)		247			(248	)		(100	)%
Total Mineral Rights segment revenues and other income	$	47,181		$	55,928		$	(8,747	)		(16	)%

19

Coal Royalty Revenues 

Approximately 65% of coal royalty revenues and approximately 45% of coal royalty sales volumes were derived from metallurgical coal during the three months ended March 31, 2026. Total coal royalty revenues decreased $5.9 million primarily due to lower metallurgical and thermal coal sales volumes during the three months ended March 31, 2026 as compared to the prior year quarter.

Total Other Revenues 

Total other revenues decreased $2.0 million primarily due to a $2.2 million decrease in production lease minimum revenues. This decrease was primarily driven by higher breakage revenues recognized in the first quarter of 2025.

Soda Ash

Revenues and other income related to our Soda Ash segment decreased $12.4 million as compared to the prior year quarter primarily due to lower sales prices in 2026.

Total Operating Expenses, Net

The following table presents the significant categories of our consolidated operating expenses:

	For the Three Months Ended March 31,				Increase			Percentage
(In thousands)	2026		2025		(Decrease)			Change
Operating expenses
Operating and maintenance expenses	$	6,113	$	6,776	$	(663	)		(10	)%
Depreciation, depletion and amortization		7,614		3,989		3,625			91	%
General and administrative expenses		5,034		6,832		(1,798	)		(26	)%
Asset impairments		—		20		(20	)		(100	)%
Total operating expenses	$	18,761	$	17,617	$	1,144			6	%

Total operating expenses, net increased $1.1 million primarily due to a $3.6 million increase in depreciation, depletion and amortization expense, partially offset by a $1.8 million decrease in general and administrative expenses. The increase in depreciation, depletion and amortization expense was primarily due to increased depletion rates on certain thermal properties. The decrease in general and administrative expenses was primarily due to lower long-term incentive expense as compared to the prior year period.

Interest Expense, Net

Interest expense, net, decreased $1.7 million due to less debt outstanding during the three months ended March 31, 2026 as compared to the prior year quarter.

Adjusted EBITDA (Non-GAAP Financial Measure)

The following table reconciles net income (loss) (the most comparable GAAP financial measure) to Adjusted EBITDA by business segment:

	Operating Segments
For the Three Months Ended (In thousands)	Mineral Rights		Soda Ash			Corporate and Financing			Total
March 31, 2026
Net income (loss)	$	33,530	$	(7,900	)	$	(6,011	)	$	19,619
Add (Less): equity in (earnings) loss from unconsolidated investment		—		7,828			—			7,828
Add: total distributions from unconsolidated investment		—		—			—			—
Add: interest expense, net		—		—			973			973
Add: depreciation, depletion and amortization		7,610		—			4			7,614
Adjusted EBITDA	$	41,140	$	(72	)	$	(5,034	)	$	36,034
March 31, 2025
Net income (loss)	$	45,208	$	4,550		$	(9,505	)	$	40,253
Add (Less): equity in (earnings) loss from unconsolidated investment		—		(4,610	)		—			(4,610	)
Add: total distributions from unconsolidated investment		—		2,940			—			2,940
Add: interest expense, net		—		—			2,668			2,668
Add: depreciation, depletion and amortization		3,985		—			4			3,989
Add: asset impairments		20		—			—			20
Adjusted EBITDA	$	49,213	$	2,880		$	(6,833	)	$	45,260

Net income decreased $20.6 million as compared to the prior year quarter primarily due to the decrease in revenues and other income as discussed above, partially offset by lower interest expense during the three months ended March 31, 2026 as compared to the prior year quarter. Adjusted EBITDA decreased $9.2 million as compared to the prior year quarter primarily due to the $8.1 million decrease in Adjusted EBITDA within our Mineral Rights segment driven by the decrease in revenues and other income as discussed above and the $3.0 million decrease in Adjusted EBITDA within our Soda Ash segment driven by no distribution received from Sisecam Wyoming during the three months ended March 31, 2026. 

20

Distributable Cash Flow ("DCF") and Free Cash Flow ("FCF") (Non-GAAP Financial Measures)

The following table presents the three major categories of the statement of cash flows by business segment:

	Operating Segments
For the Three Months Ended (In thousands)	Mineral Rights			Soda Ash			Corporate and Financing			Total
March 31, 2026
Cash flow provided by (used in)
Operating activities	$	41,827		$	(72	)	$	(8,741	)	$	33,014
Investing activities		758			(39,200	)		—			(38,442	)
Financing activities		(1,256	)		—			8,047			6,791
March 31, 2025
Cash flow provided by (used in)
Operating activities	$	43,223		$	2,880		$	(11,679	)	$	34,424
Investing activities		947			—			—			947
Financing activities		(841	)		—			(34,098	)		(34,939	)

The following table reconciles net cash provided by (used in) operating activities (the most comparable GAAP financial measure) by business segment to DCF and FCF:

	Operating Segments
For the Three Months Ended (In thousands)	Mineral Rights			Soda Ash			Corporate and Financing			Total
March 31, 2026
Net cash provided by (used in) operating activities	$	41,827		$	(72	)	$	(8,741	)	$	33,014
Add: proceeds from asset sales and disposals		—			—			—			—
Add: return of long-term contract receivable		758			—			—			758
Less: capital to unconsolidated investment		—			(39,200	)		—			(39,200	)
Distributable cash flow	$	42,585		$	(39,272	)	$	(8,741	)	$	(5,428	)
Less: proceeds from asset sales and disposals		—			—			—			—
Free cash flow	$	42,585		$	(39,272	)	$	(8,741	)	$	(5,428	)
March 31, 2025
Net cash provided by (used in) operating activities	$	43,223		$	2,880		$	(11,679	)	$	34,424
Add: proceeds from asset sales and disposals		247			—			—			247
Add: return of long-term contract receivable		700			—			—			700
Distributable cash flow	$	44,170		$	2,880		$	(11,679	)	$	35,371
Less: proceeds from asset sales and disposals		(247	)		—			—			(247	)
Free cash flow	$	43,923		$	2,880		$	(11,679	)	$	35,124

Operating cash flow, DCF and FCF decreased $1.4 million, $40.8 million and $40.6 million, respectively, as compared to the prior year quarter. The discussion by segment is as follows:

• Mineral Rights Segment

◦ Operating cash flow, DCF and FCF decreased $1.4 million, $1.6 million and $1.3 million, respectively, primarily due to lower metallurgical and thermal coal sales volumes as compared to the prior year quarter, partially offset by higher recoupments in the three months ended March 31, 2025.

• Soda Ash Segment

◦ Operating cash flow decreased $3.0 million primarily due to the $2.9 million distribution received from Sisecam Wyoming in the first quarter of 2025 and no distribution received during the three months ended March 31, 2026. DCF and FCF each decreased $42.2 million as compared to the prior year quarter primarily due to our $39.2 million capital investment made to Sisecam Wyoming in addition to the $2.9 million distribution received in the first quarter of 2025.

• Corporate and Financing Segment

◦ Operating cash flow, DCF and FCF each improved by $2.9 million as compared to the prior year quarter primarily due to lower cash paid for interest during the three months ended March 31, 2026 as a result of less debt outstanding.

21

Liquidity and Capital Resources

Current Liquidity

As of March 31, 2026, we had total liquidity of $185.4 million, consisting of $31.5 million of cash and cash equivalents and $153.9 million of borrowing capacity under our Opco Credit Facility. We have debt service obligations, including $14.3 million of principal repayments on Opco’s senior notes, throughout the remainder of 2026. The following table calculates our leverage ratio as of March 31, 2026: 

	For the Three Months Ended
(In thousands)	June 30, 2025			September 30, 2025		December 31, 2025		March 31, 2026		Last 12 Months
Net income	$	34,211		$	30,905	$	30,998	$	19,619	$	115,733
Add (Less): equity in (earnings) loss from unconsolidated investment		(2,526	)		2,390		1,686		7,828		9,378
Add: total distributions from unconsolidated investment		4,900			—		—		—		4,900
Add: interest expense, net		2,380			1,779		1,157		973		6,289
Add: depreciation, depletion and amortization		3,754			3,868		3,344		7,614		18,580
Add: asset impairments		—			—		—		—		—
Adjusted EBITDA	$	42,719		$	38,942	$	37,185	$	36,034	$	154,880
Debt—at March 31, 2026										$	60,415
Leverage Ratio										0.4 x

Cash Flows

Cash flows provided by operating activities decreased $1.4 million, from $34.4 million in the three months ended March 31, 2025 to $33.0 million in the three months ended March 31, 2026, primarily due to decreased cash flow within our Mineral Rights and Soda Ash segments, as discussed above, partially offset by lower cash paid for interest by our Corporate and Financing segment. 

Cash flows used in investing activities increased $39.4 million, from $0.9 million provided by investing activities in the three months ended March 31, 2025 to $38.4 million used by investing activities the three months ended March 31, 2026 primarily due to a $39.2 million capital investment made to Sisecam Wyoming in the first quarter of 2026. 

Cash flows provided by financing activities increased $41.7 million, from $34.9 million used by financing activities in the three months ended March 31, 2025 to $6.8 million provided by financing activities in the three months ended March 31, 2026 due to the following:

• $27.5 million increased debt borrowings during the three months ended March 31, 2026 as compared to the prior year period;

• $14.5 million less cash used for common unit distributions primarily as a result of a lower special distribution paid during the three months ended March 31, 2026 as compared to the prior year period; and,

• $3.0 million less cash used for debt repayments in 2026 as compared to 2025.

These decreases in cash flow used were partially offset by $3.3 million of increased cash used for other items, net in 2026 as compared to 2025. 

22

Capital Resources and Obligations

Debt, Net

We had the following debt outstanding as of March 31, 2026 and December 31, 2025:

	March 31,		December 31,
(In thousands)	2026		2025
Current portion of long-term debt, net	$	14,234	$	14,198
Long-term debt, net		46,084		18,884
Total debt, net	$	60,318	$	33,082

We have been and continue to be in compliance with the terms of the financial covenants contained in our debt agreements. For additional information regarding our debt and the agreements governing our debt, including the covenants contained therein, see Note 8. Debt, Net to the Consolidated Financial Statements included elsewhere in this Quarterly Report on Form 10-Q.

Off-Balance Sheet Transactions

We do not have any off-balance sheet arrangements with unconsolidated entities or related parties and accordingly, there are no off-balance sheet risks to our liquidity and capital resources from unconsolidated entities.

Related Party Transactions

The information required is set forth under Note 10. Related Party Transactions to the Consolidated Financial Statements and is incorporated herein by reference.

Summary of Critical Accounting Estimates

The preparation of Consolidated Financial Statements in conformity with generally accepted accounting principles in the United States of America requires management to make certain estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and the accompanying notes. There have been no significant changes to our critical accounting estimates from those disclosed in our Annual Report on Form 10-K for the year ended December 31, 2025.

Recently Issued Accounting Standard

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures ("ASU 2024-03"). ASU 2024-03 is intended to improve disclosures about a public business entity's expenses and provide more detailed information to investors about the types of expenses in commonly presented expense captions. The guidance is effective for annual periods beginning after December 15, 2026 and quarterly periods beginning after December 31, 2027 and can be adopted prospectively to financial statements issued for reporting periods after the effective date or retrospectively to all prior periods presented in the financial statements. We do not expect the adoption of this guidance to have a material impact on our Consolidated Financial Statements.

23

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to market risk, which includes adverse changes in commodity prices and interest rates as discussed below:

Commodity Price Risk

Our revenues, operating results, financial condition and ability to borrow funds or obtain additional capital depend on prevailing commodity prices. Historically, coal prices have been volatile, with prices fluctuating widely, and are likely to continue to be volatile. Depressed prices in the future would have a negative impact on our future financial results. In particular, substantially lower prices would significantly reduce revenues and could potentially trigger an impairment of our coal properties or a violation of certain financial debt covenants. Because substantially all our reserves are coal, changes in coal prices have a more significant impact on our financial results. 

We are dependent upon the effective marketing of the coal mined by our lessees. Our lessees sell the coal under various long-term and short-term contracts as well as on the spot market. Current conditions in the coal industry may make it difficult for our lessees to extend existing contracts or enter into supply contracts with terms of one year or more. Our lessees' failure to negotiate long-term contracts could adversely affect the stability and profitability of our lessees' operations and adversely affect our future financial results. If more coal is sold on the spot market, coal royalty revenues may become more volatile due to fluctuations in spot coal prices. 

The market price of soda ash and energy costs directly affect the profitability of Sisecam Wyoming's operations. If the market price for soda ash declines, Sisecam Wyoming's sales revenues will decrease. Historically, the global market and, to a lesser extent, the domestic market for soda ash have been volatile and are likely to remain volatile in the future. Currently soda ash prices are severely declined and Sisecam Wyoming suspended distributions in the third quarter of 2025. We cannot predict whether or when soda ash prices will recover to a level at which Sisecam Wyoming with resume distributions.

Interest Rate Risk

Our exposure to changes in interest rates results from our borrowings under the Opco Credit Facility, which is subject to variably interest rates based upon SOFR. At March 31, 2026, we had $46.1 million in borrowings outstanding under the Opco Credit Facility. If interest rates were to increase by 1%, annual interest expense would increase approximately $0.5 million, assuming the same principal amount remained outstanding during the year.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

NRP carried out an evaluation of the effectiveness of the design and operation of its disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of NRP management, including the Chief Executive Officer and Chief Financial Officer of the general partner of the general partner of NRP. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures are effective in providing reasonable assurance that (a) the information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and (b) such information is accumulated and communicated to our management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Changes in the Partnership’s Internal Control Over Financial Reporting

There were no material changes in the Partnership’s internal control over financial reporting during the first three months of 2026 that materially affected, or were reasonably likely to materially affect, the Partnership’s internal control over financial reporting.

24

PART II

ITEM 1. LEGAL PROCEEDINGS

From time to time, we are involved in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, we believe these ordinary course matters will not have a material effect on our financial position, liquidity or operations.

ITEM 1A. RISK FACTORS

During the period covered by this report, there were no material changes from the risk factors previously disclosed in Natural Resource Partners L.P.’s Annual Report on Form 10-K for the year ended December 31, 2025.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None. 

ITEM 4. MINE SAFETY DISCLOSURES

None.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

Exhibit Number	Description
3.1	Fifth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P., dated as of March 2, 2017 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on March 6, 2017).
3.2	Fifth Amended and Restated Agreement of Limited Partnership of NRP (GP) LP, dated as of December 16, 2011 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on December 16, 2011).
3.3	Fifth Amended and Restated Limited Liability Company Agreement of GP Natural Resource Partners LLC, dated as of October 31, 2013 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on October 31, 2013).
3.4	Certificate of Limited Partnership of Natural Resource Partners L.P. (incorporated by reference to Exhibit 3.1 to the Registration Statement on Form S-1 filed April 19, 2002, File No. 333-86582).
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley.
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley.
32.1**	Certification of Chief Executive Officer pursuant to 18 U.S.C. § 1350.
32.2**	Certification of Chief Financial Officer pursuant to 18 U.S.C. § 1350.
101.INS*	Inline XBRL Instance Document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Labels Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*	Cover Page Interactive Data File (formatted as inline XBRL with applicable taxonomy extension information contained in Exhibits 101)
*	Filed herewith
**	Furnished herewith

25

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned and thereunto duly authorized.

	NATURAL RESOURCE PARTNERS L.P.
	By:	NRP (GP) LP, its general partner
	By:	GP NATURAL RESOURCE
		PARTNERS LLC, its general partner
Date: May 6, 2026	By:	/s/ Corbin J. Robertson, Jr.
		Corbin J. Robertson, Jr.
		Chairman of the Board and
		Chief Executive Officer
		(Principal Executive Officer)

Date: May 6, 2026	By:	/s/ Christopher J. Zolas
		Christopher J. Zolas
		Chief Financial Officer
		(Principal Financial and Accounting Officer)

26

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Corbin J. Robertson, Jr., certify that: 

1 I have reviewed this report on Form 10-Q of Natural Resource Partners L.P.

2 Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3 Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4 The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5 The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions);

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ Corbin J. Robertson, Jr.
	Corbin J. Robertson, Jr.
	Chief Executive Officer
Date:	May 6, 2026

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Christopher J. Zolas, certify that:

1 I have reviewed this report on Form 10-Q of Natural Resource Partners L.P.

2 Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3 Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4 The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5 The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions);

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ Christopher J. Zolas
	Christopher J. Zolas
	Chief Financial Officer
Date:	May 6, 2026

EX-32.1

Exhibit 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

OF GP NATURAL RESOURCE PARTNERS LLC

PURSUANT TO 18 U.S.C. § 1350

In connection with the accompanying report on Form 10-Q for the quarter ended March 31, 2026 filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Corbin J. Robertson, Jr., Chief Executive Officer of GP Natural Resource Partners LLC, the general partner of the general partner of Natural Resource Partners L.P. (the “Company”), hereby certify, to my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Corbin J. Robertson, Jr.
	Corbin J. Robertson, Jr.
	Chief Executive Officer
Date:	May 6, 2026

EX-32.2

Exhibit 32.2

CERTIFICATION OF

CHIEF FINANCIAL OFFICER

OF GP NATURAL RESOURCE PARTNERS LLC

PURSUANT TO 18 U.S.C. § 1350

In connection with the accompanying report on Form 10-Q for the quarter ended March 31, 2026 filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Christopher J. Zolas, Chief Financial Officer of GP Natural Resource Partners LLC, the general partner of the general partner of Natural Resource Partners L.P. (the “Company”), hereby certify, to my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Christopher J. Zolas
	Christopher J. Zolas
	Chief Financial Officer
Date:	May 6, 2026

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Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2026	May 06, 2026
Document Information [Line Items]
Entity Central Index Key	0001171486
Entity Registrant Name	NATURAL RESOURCE PARTNERS LP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2026
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-31465
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2164875
Entity Address, Address Line One	1415 Louisiana Street, Suite 3325
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	751-7507
Title of 12(b) Security	Common Units representing limited partner interests
Trading Symbol	NRP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		13,250,412

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Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets
Cash and cash equivalents	$ 31,504	$ 30,141
Accounts receivable, net	26,792	28,666
Other current assets, net	1,425	2,105
Total current assets	59,721	60,912
Land	24,007	24,008
Mineral rights, net	360,860	366,987
Intangible assets, net	10,426	11,908
Equity in unconsolidated investment	281,477	250,244
Long-term contract receivable, net	19,598	20,406
Other long-term assets, net	15,568	13,900
Total assets	771,657	748,365
Current liabilities
Accounts payable	2,448	1,159
Accrued liabilities	4,605	10,897
Accrued interest	279	69
Current portion of deferred revenue	7,029	6,663
Current portion of debt, net	14,234	14,198
Total current liabilities	28,595	32,986
Deferred revenue	59,136	58,067
Long-term debt, net	46,084	18,884
Other non-current liabilities	5,310	5,909
Total liabilities	139,125	115,846
Commitments and contingencies (see Note 12)
Partners’ capital
Common unitholders’ interest (13,250,412 and 13,138,097 units issued and outstanding at March 31, 2026 and December 31, 2025, respectively)	624,902	625,188
General partner’s interest	11,771	11,332
Accumulated other comprehensive loss	(4,141)	(4,001)
Total partners’ capital	632,532	632,519
Total liabilities and partners' capital	$ 771,657	$ 748,365

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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - shares	Mar. 31, 2026	Dec. 31, 2025
Common unitholders interest, issued (in shares)	13,250,412	13,138,097
Common unitholders interest, outstanding (in shares)	13,250,412	13,138,097

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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Revenues and other income
Equity in earnings (loss) of Sisecam Wyoming		$ (7,828)	$ 4,610
Gain (loss) on asset sales and disposals		(1)	247
Total revenues and other income		39,353	60,538
Operating expenses
Operating and maintenance expenses		6,113	6,776
Depreciation, depletion and amortization		7,614	3,989
General and administrative expenses		5,034	6,832
Asset impairments		0	20
Total operating expenses		18,761	17,617
Income from operations		20,592	42,921
Interest expense, net	[1]	(973)	(2,668)
Net income		19,619	40,253
Net income attributable to common unitholders		19,227	39,448
Net income attributable to the general partner		$ 392	$ 805
Net income per common unit (see Note 4)
Basic (in dollars per share)		$ 1.46	$ 3.01
Diluted (in dollars per share)		$ 1.44	$ 2.97
Net income		$ 19,619	$ 40,253
Comprehensive income (loss) from unconsolidated investment and other		(140)	2,260
Comprehensive income		19,479	42,513
Mineral Rights Segment [Member]
Operating expenses
Depreciation, depletion and amortization		6,100	3,700
Royalty and Other Mineral Rights [Member] | Mineral Rights Segment [Member]
Revenues and other income
Revenues		43,297	51,260
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]
Revenues and other income
Revenues		$ 3,885	$ 4,421

[1] Included in interest expense, net was $0.2 million of interest income for both the three months ended March 31, 2026 and 2025.

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Consolidated Statements of Partners' Capital (Unaudited) - USD ($) $ in Thousands	Total	AOCI Attributable to Parent [Member]	Limited Partner [Member]	General Partner [Member]
Balance (in shares) at Dec. 31, 2024			13,049
Balance at Dec. 31, 2024	$ 551,108	$ (1,670)	$ 543,231	$ 9,547
Net income	40,253		39,448	805
Distributions to common unitholders and the general partner	(26,276)		$ (25,750)	(526)
Issuance of unit-based awards (in shares)			89
Unit-based awards amortization and vesting, net	(3,175)		$ (3,175)
Capital contribution	187			187
Comprehensive loss from unconsolidated investment and other	2,260	2,260
Balance (in shares) at Mar. 31, 2025			13,138
Balance at Mar. 31, 2025	564,357	590	$ 553,754	10,013
Balance (in shares) at Dec. 31, 2025			13,138
Balance at Dec. 31, 2025	632,519	(4,001)	$ 625,188	11,332
Net income	19,619		19,227	392
Distributions to common unitholders and the general partner	(11,763)		$ (11,528)	(235)
Issuance of unit-based awards (in shares)			112
Unit-based awards amortization and vesting, net	(7,985)		$ (7,985)
Capital contribution	282			282
Comprehensive loss from unconsolidated investment and other	(140)	(140)
Balance (in shares) at Mar. 31, 2026			13,250
Balance at Mar. 31, 2026	$ 632,532	$ (4,141)	$ 624,902	$ 11,771

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities
Net income	$ 19,619	$ 40,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	7,614	3,989
Distributions from unconsolidated investment	0	2,940
Equity in (earnings) loss from unconsolidated investment	7,828	(4,610)
Loss (gain) on asset sales and disposals	1	(247)
Asset impairments	0	20
Bad debt expense	(776)	451
Unit-based compensation expense	1,164	2,717
Amortization of debt issuance costs and other	447	(168)
Change in operating assets and liabilities:
Accounts receivable	615	(149)
Accounts payable	1,290	546
Accrued liabilities	(7,156)	(7,990)
Accrued interest	210	254
Deferred revenue	1,434	(3,227)
Other items, net	724	(355)
Net cash provided by operating activities	33,014	34,424
Cash flows from investing activities
Proceeds from asset sales and disposals	0	247
Capital to unconsolidated investment	(39,200)	0
Return of long-term contract receivable	758	700
Net cash provided by (used in) investing activities	(38,442)	947
Cash flows from financing activities
Debt borrowings	61,200	33,700
Debt repayments	(34,000)	(37,000)
Distributions to unitholders	(11,763)	(26,276)
Other items, net	(8,646)	(5,363)
Net cash provided by (used in) financing activities	6,791	(34,939)
Net increase in cash and cash equivalents	1,363	432
Cash and cash equivalents at beginning of period	30,141	30,444
Cash and cash equivalents at end of period	31,504	30,876
Supplemental cash flow information:
Cash paid for interest	$ 684	$ 2,371

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Note 1 - Basis of Presentation

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Basis of Presentation and Significant Accounting Policies [Text Block]

1.    Basis of Presentation

Nature of Business

Natural Resource Partners L.P. (the "Partnership") engages principally in the business of owning, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal and other natural resources and owns a non-controlling 49% interest in Sisecam Wyoming LLC ("Sisecam Wyoming"), a trona ore mining and soda ash production business. The Partnership is organized into two operating segments further described in Note 5. Segment Information. The Partnership’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Partnership owns its subsidiaries through one wholly owned operating company, NRP (Operating) LLC ("Opco"). As used in these Notes to Consolidated Financial Statements, the terms "NRP," "we," "us" and "our" refer to Natural Resource Partners L.P. and its subsidiaries, unless otherwise stated or indicated by context.

Principles of Consolidation and Reporting

The accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the financial statements for the year ended December 31, 2025, and notes thereto included in the Partnership's Annual Report on Form 10-K, which was filed with the SEC on February 27, 2026. 

Recently Issued Accounting Standard

In  November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures ("ASU 2024-03"). ASU 2024-03 is intended to improve disclosures about a public business entity's expenses and provide more detailed information to investors about the types of expenses in commonly presented expense captions. The guidance is effective for annual periods beginning after  December 15, 2026, and quarterly periods beginning after  December 31, 2027, and can be adopted prospectively to financial statements issued for reporting periods after the effective date or retrospectively to all prior periods presented in the financial statements. NRP does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements.

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Note 2 - Revenues from Contracts with Customers

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

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 March 31,
(In thousands)	2026		2025
Coal royalty revenues	$	29,574	$	35,498
Production lease minimum revenues		558		2,725
Minimum lease straight-line revenues		4,019		4,050
Oil and gas royalty revenues		1,386		2,444
Carbon neutral revenues		185		595
Property tax revenues		1,711		1,637
Wheelage revenues		1,990		1,738
Coal overriding royalty revenues		1,386		880
Lease amendment revenues		1,200		655
Aggregates royalty revenues		1,118		853
Other revenues		170		185
Royalty and other mineral rights revenues	$	43,297	$	51,260
Transportation and processing services revenues		3,408		3,885
Total Mineral Rights segment revenues from contracts with customers	$	46,705	$	55,145

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

	March 31,		December 31,
(In thousands)	2026		2025
Contract assets
Accounts receivable, net	$	22,422	$	24,372
Other current assets, net		—		84
Other long-term assets, net		7,234		5,281
Contract liabilities
Accounts payable	$	125	$	211
Current portion of deferred revenue		7,029		6,663
Deferred revenue		59,136		58,067

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

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Balance at beginning of period (current and non-current)	$	64,730		$	60,155
Increase due to minimums and lease amendment fees		10,942			5,861
Recognition of previously deferred revenue		(9,507	)		(9,088	)
Balance at end of period (current and non-current)	$	66,165		$	56,928

The Partnership's non-cancellable annual minimum payments due under the lease terms of its coal and aggregates royalty contracts with customers are as follows as of  March 31, 2026 (in thousands): 

Lease Term (1)	Weighted Average Remaining Years		Annual Minimum Payments
0 - 5 years		2.1	$	13,269
5 - 10 years		6.2		15,493
10+ years		10.0		26,309
Total		7.0	$	55,071

⁽¹⁾ Lease term does not include renewal periods.

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Note 3 - Common Unit Distributions

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Partners' Capital Notes Disclosure [Text Block]

3.    Common Unit Distributions

The Partnership makes cash distributions to common unitholders on a quarterly basis, subject to approval by the Board of Directors of GP Natural Resource Partners LLC (the "Board of Directors"). NRP recognizes common unit distributions on the date the distribution is declared.

Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions.

The following table shows the cash distributions declared and paid to common unitholders during the three months ended March 31, 2026 and 2025, respectively:

Month Paid	Period Covered by Distribution	Distribution per Unit		Total Distribution (1) (In thousands)
2026
February	October 1 - December 31, 2025	$	0.75	$	10,141
March (2)	Special Distribution		0.12		1,622
2025
February	October 1 - December 31, 2024	$	0.75	$	10,055
March (3)	Special Distribution		1.21		16,221

(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 2025.
(3)	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2024.

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Note 4 - Net Income Per Common Unit

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Earnings Per Share [Text Block]

4.    Net Income Per Common Unit 

Basic net income per common unit is computed by dividing net income, after considering the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's unvested unit-based awards if the inclusion of these items is dilutive.

The dilutive effect of the unvested unit-based awards is calculated using the treasury stock method, which assumes that the proceeds from the vesting of the unvested unit-based awards are used to purchase common units at the average market price for the period. The calculation of diluted net income per common unit for the three months ended March 31, 2026 and 2025 included the impact of the vesting of the unvested unit-based awards.

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 March 31,
(In thousands, except per unit data)	2026			2025
Basic net income per common unit
Net income attributable to common unitholders	$	19,227		$	39,448
Weighted average common units—basic		13,199			13,098
Basic net income per common unit	$	1.46		$	3.01
Diluted net income per common unit
Weighted average common units—basic		13,199			13,098
Plus: dilutive effect of unvested unit-based awards		151			206
Weighted average common units—diluted		13,350			13,304
Diluted net income attributable to common unitholders and the general partner	$	19,619		$	40,253
Less: diluted net income attributable to the general partner		(392	)		(805	)
Diluted net income attributable to common unitholders	$	19,227		$	39,448
Diluted net income per common unit	$	1.44		$	2.97

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Note 5 - Segment Information

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Segment Reporting [Text Block]

5.    Segment Information 

The Partnership's segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. and that are managed accordingly. NRP has the following two operating segments:

Mineral Rights—consists of mineral interests and other subsurface rights across the United States. NRP's ownership provides critical inputs for the manufacturing of steel, electricity, and basic building materials, as well as opportunities for carbon sequestration and renewable energy.

Soda Ash—consists of the Partnership's 49% non-controlling equity interest in Sisecam Wyoming, one of the world's lowest-cost producers of soda ash, an essential ingredient for the manufacturing of glass, detergents, solar panels, and batteries for electric vehicles. Operations are managed by NRP's partner, Sisecam Chemicals Wyoming, LLC, and NRP realizes cash flow when distributions are paid to it.

Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include salaries and benefits, insurance, property taxes, legal, royalty, information technology and shared facilities services and are included in operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income.

Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include interest and financing, corporate headquarters and overhead, centralized treasury, legal and accounting and other corporate-level activity not specifically allocated to a segment and are included in general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income.

NRP’s Chief Operating Decision Makers (“CODMs”) are its Chief Executive Officer and President and Chief Operating Officer. They evaluate the Partnership’s performance through a review of the segments’ net income and free cash flow as compared to budget and utilize this information to assess the segments’ performance and allocate resources. NRP does not conduct operations on any of its assets or directly engage in any type of industrial activity. Instead, it leases its mineral and other rights to companies that conduct operations on its properties in exchange for paying royalties and other fees to the Partnership. Operating expenses, capital costs and other liabilities arising out of production activities are borne entirely by NRP's lessees. In the case of its soda ash investment, operations are managed by NRP's partner, Sisecam Chemicals Wyoming LLC. NRP has determined its significant segment expenses to be its employee related expenses, including compensation (salaries, benefits and bonus) and long-term incentive compensation as well as interest expense and property tax expense. The Partnership is responsible for paying property taxes on the properties it owns. Typically, NRP's lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties and this reimbursement amount is included within the Mineral Rights segment revenues.

The following tables summarize certain financial information for each of the Partnership's business segments:

	Operating Segments
(In thousands)	Mineral Rights			Soda Ash			Total Operating Segments			Corporate and Financing			Total
For the Three Months Ended March 31, 2026
Revenues	$	47,182		$	—		$	47,182		$	—		$	47,182
Equity in earnings of Sisecam Wyoming		—			(7,828	)		(7,828	)		—			(7,828	)
Gain on asset sales and disposals		(1	)		—			(1	)		—			(1	)
Total revenues and other income	$	47,181		$	(7,828	)	$	39,353		$	—		$	39,353
Less:
Compensation (salaries, benefits and bonus)	$	1,797		$	—		$	1,797		$	2,064		$	3,861
Long-term incentive compensation (1)		262			—			262			907			1,169
Property taxes		1,879			—			1,879			—			1,879
Depreciation, depletion and amortization		7,610			—			7,610			4			7,614
Asset impairments		—			—			—			—			—
Interest expense, net (2)		—			—			—			973			973
Other segment items (3)		2,103			72			2,175			2,063			4,238
Net income (loss)	$	33,530		$	(7,900	)	$	25,630		$	(6,011	)	$	19,619
As of March 31, 2026
Total assets	$	484,989		$	281,477		$	766,466		$	5,191		$	771,657
For the Three Months Ended March 31, 2025
Revenues	$	55,681		$	—		$	55,681		$	—		$	55,681
Equity in earnings of Sisecam Wyoming		—			4,610			4,610			—			4,610
Gain on asset sales and disposals		247			—			247			—			247
Total revenues and other income	$	55,928		$	4,610		$	60,538		$	—		$	60,538
Less:
Compensation (salaries, benefits and bonus)	$	1,938		$	—		$	1,938		$	2,109		$	4,047
Long-term incentive compensation (4)		464			—			464			2,261			2,725
Property taxes		1,792			—			1,792			—			1,792
Depreciation, depletion and amortization		3,985			—			3,985			4			3,989
Asset impairments		20			—			20			—			20
Interest expense, net (2)		—			—			—			2,668			2,668
Other segment items (3)		2,521			60			2,581			2,463			5,044
Net income (loss)	$	45,208		$	4,550		$	49,758		$	(9,505	)	$	40,253
As of December 31, 2025
Total assets	$	492,672		$	250,244		$	742,916		$	5,449		$	748,365

⁽¹⁾ Long-term incentive compensation for the three months ended March 31, 2026 includes (1) Mineral Rights segment: $0.1 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $0.8 million of equity compensation and $0.1 million of cash compensation.

⁽²⁾ Included in interest expense, net was $0.2 million of interest income for both the three months ended March 31, 2026 and 2025. 

(3)

Other segment items in the Mineral Rights segment primarily include: insurance, legal, overriding royalty expense, processing and transportation expense, information technology, shared facility services, rent, professional fees and bad debt expense. Other segment items in the Soda Ash segment primarily include professional fees. Other segment items in the Corporate and Financing segment primarily include: insurance, legal, information technology, shared facility services, rent and professional fees.

(4)

Long-term incentive compensation for the three months ended March 31, 2025 includes (1) Mineral Rights segment: $0.3 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $2.2 million of equity compensation and $0.1 million of cash compensation.

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Note 6 - Equity Investment

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Equity Method Investments and Joint Ventures Disclosure [Text Block]

6.    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 March 31,
(In thousands)	2026			2025
Balance at beginning of period	$	250,244		$	257,355
Income (loss) allocation to NRP’s equity interests (1)		(6,697	)		5,764
Amortization of basis difference		(1,130	)		(1,153	)
Capital investment		39,200			—
Other comprehensive income (loss)		(140	)		2,260
Distributions		—			(2,940	)
Balance at end of period	$	281,477		$	261,286

⁽¹⁾ Amounts reclassified into income (loss) out of accumulated other comprehensive loss were $1.6 million and $1.3 million for the three months ended March 31, 2026 and 2025, respectively.

During the three months ended March 31, 2026, NRP and Sisecam Wyoming's managing partner made a capital investment into Sisecam Wyoming ($39.2 million for NRP's 49%) to reduce outstanding amounts under Sisecam Wyoming's bank credit facility.

The following table represents summarized financial information for Sisecam Wyoming as derived from their respective unaudited financial statements for the three months ended March 31, 2026 and 2025:

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Net sales	$	127,335		$	153,309
Gross profit (loss)		(4,731	)		19,033
Net income (loss)		(13,667	)		11,764

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Note 7 - Mineral Rights, Net

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Mineral Industries Disclosures [Text Block]

7.    Mineral Rights, Net 

The Partnership’s mineral rights consist of the following:

	March 31, 2026							December 31, 2025
(In thousands)	Carrying Value		Accumulated Depletion			Net Book Value		Carrying Value		Accumulated Depletion			Net Book Value
Coal properties	$	653,808	$	(310,427	)	$	343,381	$	653,808	$	(304,412	)	$	349,396
Aggregates properties		8,655		(4,439	)		4,216		8,655		(4,364	)		4,291
Oil and gas royalty properties		12,354		(10,621	)		1,733		12,354		(10,584	)		1,770
Other		13,142		(1,612	)		11,530		13,142		(1,612	)		11,530
Total mineral rights, net	$	687,959	$	(327,099	)	$	360,860	$	687,959	$	(320,972	)	$	366,987

Depletion expense related to the Partnership’s mineral rights is included in depreciation, depletion and amortization on its Consolidated Statements of Comprehensive Income and totaled $6.1 million and $3.7 million for the three months ended March 31, 2026 and 2025, respectively.

The Partnership has developed procedures to evaluate its long-lived assets for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not be recoverable. Potential events or circumstances include, but are not limited to, specific events such as a reduction in economically recoverable minerals or production ceasing on a property for an extended period. This analysis is based on historic, current and future performance and considers both quantitative and qualitative information. As a result of the Partnership's analysis, NRP recorded an immaterial impairment expense during the three months ended March 31, 2025.

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Note 8 - Debt, Net

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Debt Disclosure [Text Block]

8.    Debt, Net

The Partnership's debt consists of the following:

	March 31,			December 31,
(In thousands)	2026			2025
Opco Credit Facility	$	46,084		$	18,884
Opco Senior Notes
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026	$	11,420		$	11,420
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		2,911			2,911
Total Opco Senior Notes	$	14,331		$	14,331
Total debt at face value	$	60,415		$	33,215
Net unamortized debt issuance costs		(97	)		(133	)
Total debt, net	$	60,318		$	33,082
Less: current portion of debt		(14,234	)		(14,198	)
Total long-term debt, net	$	46,084		$	18,884

Opco Debt

All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries, other than BRP LLC and NRP Trona LLC. As of March 31, 2026 and December 31, 2025, Opco was in compliance with the terms of the financial covenants contained in its debt agreements.

Opco Credit Facility

As of December 31, 2025, the Partnership had $18.9 million in borrowings outstanding under the Opco Credit Facility and $181.1 million of available borrowing capacity. During the three months ended March 31, 2026, the Partnership borrowed $61.2 million and repaid $34.0 million, resulting in $46.1 million in borrowings outstanding under the Opco Credit Facility and $153.9 million of available borrowing capacity as of March 31, 2026. During the three months ended March 31, 2025, the Partnership borrowed $33.7 million and repaid $37.0 million on the Opco Credit Facility. The weighted average interest rate for the borrowings outstanding under the Opco Credit Facility for the three months ended March 31, 2026 and 2025 were 7.28% and 7.93%, respectively.

The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values of $284.8 million and $290.6 million classified as mineral rights, net and other long-term assets, net and $19.6 million and $20.4 million classified as long-term contract receivable, net on the Partnership’s Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025, respectively.

The Opco Credit Facility contains financial covenants requiring Opco to maintain:

• 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 March 31, 2026, this ratio was 0.4x; and

• an interest coverage ratio of consolidated EBITDDA to the sum of consolidated interest expense and consolidated lease expense (in each case as defined in the Opco Credit Facility) of not less than 3.5 to 1.0. As of March 31, 2026, this ratio was 21.4x.

Opco Senior Notes   

Opco issued several series of private placement senior notes (the "Opco Senior Notes") with various interest rates and principal due dates. As of March 31, 2026, the 5.03% and 5.18% Opco Senior Notes remain outstanding. These Opco Senior Notes have principal due annually in December and interest due semi-annually in June and December. As of both  March 31, 2026 and December 31, 2025, the Opco Senior Notes had cumulative principal balances of $14.3 million. These Opco Senior Notes will fully mature in December 2026.

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Note 9 - Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Fair Value Disclosures [Text Block]

9.    Fair Value Measurements 

Fair Value of Financial Assets and Liabilities

The Partnership’s financial assets and liabilities consist of cash and cash equivalents, accounts receivables, a contract receivable, accounts payables and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents, accounts receivables and accounts payables approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its contract receivable and debt.

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

			March 31, 2026				December 31, 2025
	Fair Value		Carrying		Estimated		Carrying		Estimated
(In thousands)	Hierarchy Level		Value		Fair Value		Value		Fair Value
Assets:
Contract receivable, net (current and long-term) (1)		3	$	22,734	$	20,233	$	23,480	$	20,792
Debt:
Opco Senior Notes (2)		3	$	14,234	$	14,025	$	14,198	$	14,018
Opco Credit Facility (3)		3		46,084		46,084		18,884		18,884

(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 March 31, 2026 and December 31, 2025.
(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 the debt at any time without penalty.

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Note 10 - Related Party Transactions

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Related Party Transactions Disclosure [Text Block]

10.    Related Party Transactions 

Affiliates of our General Partner

The Partnership’s general partner does not receive any management fee or other compensation for its management of NRP. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for services provided to the Partnership and for expenses incurred on the Partnership’s behalf. Employees of Quintana Minerals Corporation ("QMC") and Western Pocahontas Properties Limited Partnership ("WPPLP"), affiliates of the Partnership, provide their services to manage the Partnership's business. QMC and WPPLP charge the Partnership the portion of their employee salary and benefits costs related to their employee services provided to NRP. These QMC and WPPLP employee management service costs are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income. NRP also reimburses overhead costs incurred by its affiliates, and other related parties, to manage the Partnership's business. These overhead costs include certain rent, information technology, administration of employee benefits and other corporate services incurred by or on behalf of the Partnership’s general partner and its affiliates and are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income.

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

	For the Three Months Ended March 31,
(In thousands)	2026		2025
Operating and maintenance expenses	$	1,622	$	1,793
General and administrative expenses		1,566		1,569

The Partnership had accounts payable to related parties of $0.6 million and $0.7 million on its Consolidated Balance Sheets as of  March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026 and December 31, 2025, the Partnership had $0.1 million and $0.2 million, respectively, of prepaid expenses included in other current assets, net on its Consolidated Balance Sheets.

As a result of its office lease with WPPLP, the Partnership has a right-of-use asset and lease liability of $3.4 million included in other long-term assets, net and other non-current liabilities, respectively on its Consolidated Balance Sheets at both  March 31, 2026 and December 31, 2025.

During the three months ended March 31, 2026 and 2025, the Partnership recognized $1.2 million and $0.1 million, respectively, in operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to an overriding royalty agreement with WPPLP. The Partnership also had $1.2 million and $0.1 million in accounts payable on its Consolidated Balance Sheets as of  March 31, 2026 and December 31, 2025, respectively, related to this agreement. As of both March 31, 2026 and December 31, 2025, the Partnership had $1.1 million of other long-term assets, net on its Consolidated Balance Sheets related to a prepaid royalty for this agreement. 

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Note 11 - Major Customers

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

11.    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 March 31,
	2026					2025
(In thousands)	Revenues		Percent			Revenues		Percent
Alpha Metallurgical Resources, Inc. (1)	$	13,701		29	%	$	13,176		24	%
Foresight Energy Resources LLC ("Foresight") (1)	$	13,497		29	%	$	16,460		30	%
Alabama Kanu Holdings, LLC (1)	$	4,730		10	%	$	3,258		6	%

⁽¹⁾ Revenues from Alpha Metallurgical Resources, Inc., Foresight, and Alabama Kanu Holdings, LLC are generated in the United States of America and are included within the Partnership's Mineral Rights segment.

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Note 12 - Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

12.    Commitments and Contingencies

NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these ordinary course matters will not have a material effect on the Partnership’s financial position, liquidity or operations as of and for the three months ended March 31, 2026.

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Note 13 - Unit-Based Compensation

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Share-Based Payment Arrangement [Text Block]

13.    Unit-Based Compensation 

During the three months ended March 31, 2026 and 2025, the Partnership granted service, performance and market-based awards under its 2017 Long-Term Incentive Plan. The Partnership's service and performance-based awards are valued using the closing price of NRP's common units as of the grant date while the Partnership's market-based awards are valued using a Monte Carlo simulation. The grant date fair value of the awards granted during the three months ended March 31, 2026 and 2025 was $8.6 million and $6.8 million, respectively, which included a grant date fair value of $3.1 million and $2.5 million for the market-based awards valued using a Monte Carlo simulation during the three months ended March 31, 2026 and 2025, respectively. Total unit-based compensation expense associated with service, performance and market-based awards was $1.2 million and $2.7 million for the three months ended March 31, 2026 and 2025, respectively, and is included in general and administrative expenses and operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. The unamortized cost associated with unvested outstanding awards as of March 31, 2026 was $11.9 million, which will be recognized over a weighted average period of 2.3 years. The unamortized cost associated with unvested outstanding awards as of  December 31, 2025 was $5.9 million. The Partnership paid $8.9 million and $5.5 million in cash during the three months ended  March 31, 2026 and 2025, respectively, for taxes on the unit-based award settlements during the respective years. These cash payments are included in other items, net under cash flows from financing activities on the Partnership's Consolidated Statements of Cash Flows. 

A summary of the unit activity in the outstanding grants during 2026 is as follows:

(In thousands)	Common Units			Weighted Average Grant Date Fair Value per Common Unit
Outstanding at January 1, 2026		266		$	78.68
Granted		65		$	132.29
Fully vested and issued		(155	)	$	65.19
Outstanding at March 31, 2026		176		$	110.54

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Note 14 - Credit Losses

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Credit Loss, Financial Instrument [Text Block]

14.    Credit Losses 

The Partnership is exposed to credit losses through collection of its short-term trade receivables resulting from contracts with customers and a long-term receivable resulting from a financing transaction with a customer. The Partnership records an allowance for current expected credit losses on these receivables based on the loss-rate method. NRP assessed the likelihood of collection of its receivables utilizing historical loss rates, current market conditions, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. Examples of these facts or circumstances include, but are not limited to, contract disputes or renegotiations with the customer and evaluation of short and long-term economic viability of the contracted property. For its long-term contract receivable, management reverts to the historical loss experience immediately after the reasonable and supportable forecast period ends.

As of March 31, 2026 and December 31, 2025, NRP had the following current expected credit loss (“CECL”) allowance related to its receivables and long-term contract receivable:

	March 31, 2026							December 31, 2025
(In thousands)	Gross		CECL Allowance			Net		Gross		CECL Allowance			Net
Receivables	$	35,431	$	(3,565	)	$	31,866	$	36,178	$	(4,183	)	$	31,995
Long-term contract receivable		20,301		(703	)		19,598		21,138		(732	)		20,406
Total	$	55,732	$	(4,268	)	$	51,464	$	57,316	$	(4,915	)	$	52,401

NRP recorded reversals of $0.6 million and $0.3 million of operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to the change in the CECL allowance during the three months ended March 31, 2026 and 2025, respectively.

NRP has procedures in place to monitor its ongoing credit exposure through timely review of counterparty balances against contract terms and due dates, account and financing receivable reconciliation, bankruptcy monitoring, lessee audits and dispute resolution. The Partnership may employ legal counsel or collection specialists to pursue recovery of defaulted receivables.

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Note 15 - Subsequent Events

3 Months Ended

Mar. 31, 2026

Notes to Financial Statements

Subsequent Events [Text Block]

15.    Subsequent Events

The following represents material events that occurred after  March 31, 2026 through the time of the Partnership’s filing of its Quarterly Report on Form 10-Q with the SEC:

Common Unit Distributions

In May 2026, the Board of Directors declared a distribution of $0.75 per common unit with respect to the first quarter of 2026. 

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Insider Trading Arrangements

3 Months Ended

Mar. 31, 2026

Trading Arrangements, by Individual [Table]

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

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Note 2 - Revenues from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Disaggregation of Revenue [Table Text Block]

	For the Three Months Ended March 31,
(In thousands)	2026		2025
Coal royalty revenues	$	29,574	$	35,498
Production lease minimum revenues		558		2,725
Minimum lease straight-line revenues		4,019		4,050
Oil and gas royalty revenues		1,386		2,444
Carbon neutral revenues		185		595
Property tax revenues		1,711		1,637
Wheelage revenues		1,990		1,738
Coal overriding royalty revenues		1,386		880
Lease amendment revenues		1,200		655
Aggregates royalty revenues		1,118		853
Other revenues		170		185
Royalty and other mineral rights revenues	$	43,297	$	51,260
Transportation and processing services revenues		3,408		3,885
Total Mineral Rights segment revenues from contracts with customers	$	46,705	$	55,145

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

	March 31,		December 31,
(In thousands)	2026		2025
Contract assets
Accounts receivable, net	$	22,422	$	24,372
Other current assets, net		—		84
Other long-term assets, net		7,234		5,281
Contract liabilities
Accounts payable	$	125	$	211
Current portion of deferred revenue		7,029		6,663
Deferred revenue		59,136		58,067

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Balance at beginning of period (current and non-current)	$	64,730		$	60,155
Increase due to minimums and lease amendment fees		10,942			5,861
Recognition of previously deferred revenue		(9,507	)		(9,088	)
Balance at end of period (current and non-current)	$	66,165		$	56,928

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

Lease Term (1)	Weighted Average Remaining Years		Annual Minimum Payments
0 - 5 years		2.1	$	13,269
5 - 10 years		6.2		15,493
10+ years		10.0		26,309
Total		7.0	$	55,071

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Note 3 - Common Unit Distributions (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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

Month Paid	Period Covered by Distribution	Distribution per Unit		Total Distribution (1) (In thousands)
2026
February	October 1 - December 31, 2025	$	0.75	$	10,141
March (2)	Special Distribution		0.12		1,622
2025
February	October 1 - December 31, 2024	$	0.75	$	10,055
March (3)	Special Distribution		1.21		16,221

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Note 4 - Net Income Per Common Unit (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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

	For the Three Months Ended March 31,
(In thousands, except per unit data)	2026			2025
Basic net income per common unit
Net income attributable to common unitholders	$	19,227		$	39,448
Weighted average common units—basic		13,199			13,098
Basic net income per common unit	$	1.46		$	3.01
Diluted net income per common unit
Weighted average common units—basic		13,199			13,098
Plus: dilutive effect of unvested unit-based awards		151			206
Weighted average common units—diluted		13,350			13,304
Diluted net income attributable to common unitholders and the general partner	$	19,619		$	40,253
Less: diluted net income attributable to the general partner		(392	)		(805	)
Diluted net income attributable to common unitholders	$	19,227		$	39,448
Diluted net income per common unit	$	1.44		$	2.97

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Note 5 - Segment Information (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Segment Reporting [Table Text Block]

	Operating Segments
(In thousands)	Mineral Rights			Soda Ash			Total Operating Segments			Corporate and Financing			Total
For the Three Months Ended March 31, 2026
Revenues	$	47,182		$	—		$	47,182		$	—		$	47,182
Equity in earnings of Sisecam Wyoming		—			(7,828	)		(7,828	)		—			(7,828	)
Gain on asset sales and disposals		(1	)		—			(1	)		—			(1	)
Total revenues and other income	$	47,181		$	(7,828	)	$	39,353		$	—		$	39,353
Less:
Compensation (salaries, benefits and bonus)	$	1,797		$	—		$	1,797		$	2,064		$	3,861
Long-term incentive compensation (1)		262			—			262			907			1,169
Property taxes		1,879			—			1,879			—			1,879
Depreciation, depletion and amortization		7,610			—			7,610			4			7,614
Asset impairments		—			—			—			—			—
Interest expense, net (2)		—			—			—			973			973
Other segment items (3)		2,103			72			2,175			2,063			4,238
Net income (loss)	$	33,530		$	(7,900	)	$	25,630		$	(6,011	)	$	19,619
As of March 31, 2026
Total assets	$	484,989		$	281,477		$	766,466		$	5,191		$	771,657
For the Three Months Ended March 31, 2025
Revenues	$	55,681		$	—		$	55,681		$	—		$	55,681
Equity in earnings of Sisecam Wyoming		—			4,610			4,610			—			4,610
Gain on asset sales and disposals		247			—			247			—			247
Total revenues and other income	$	55,928		$	4,610		$	60,538		$	—		$	60,538
Less:
Compensation (salaries, benefits and bonus)	$	1,938		$	—		$	1,938		$	2,109		$	4,047
Long-term incentive compensation (4)		464			—			464			2,261			2,725
Property taxes		1,792			—			1,792			—			1,792
Depreciation, depletion and amortization		3,985			—			3,985			4			3,989
Asset impairments		20			—			20			—			20
Interest expense, net (2)		—			—			—			2,668			2,668
Other segment items (3)		2,521			60			2,581			2,463			5,044
Net income (loss)	$	45,208		$	4,550		$	49,758		$	(9,505	)	$	40,253
As of December 31, 2025
Total assets	$	492,672		$	250,244		$	742,916		$	5,449		$	748,365

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Note 6 - Equity Investment (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Equity Method Investments [Table Text Block]

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Balance at beginning of period	$	250,244		$	257,355
Income (loss) allocation to NRP’s equity interests (1)		(6,697	)		5,764
Amortization of basis difference		(1,130	)		(1,153	)
Capital investment		39,200			—
Other comprehensive income (loss)		(140	)		2,260
Distributions		—			(2,940	)
Balance at end of period	$	281,477		$	261,286

	For the Three Months Ended March 31,
(In thousands)	2026			2025
Net sales	$	127,335		$	153,309
Gross profit (loss)		(4,731	)		19,033
Net income (loss)		(13,667	)		11,764

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Note 7 - Mineral Rights, Net (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Mineral Properties Disclosure [Table Text Block]

	March 31, 2026							December 31, 2025
(In thousands)	Carrying Value		Accumulated Depletion			Net Book Value		Carrying Value		Accumulated Depletion			Net Book Value
Coal properties	$	653,808	$	(310,427	)	$	343,381	$	653,808	$	(304,412	)	$	349,396
Aggregates properties		8,655		(4,439	)		4,216		8,655		(4,364	)		4,291
Oil and gas royalty properties		12,354		(10,621	)		1,733		12,354		(10,584	)		1,770
Other		13,142		(1,612	)		11,530		13,142		(1,612	)		11,530
Total mineral rights, net	$	687,959	$	(327,099	)	$	360,860	$	687,959	$	(320,972	)	$	366,987

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Note 8 - Debt, Net (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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

	March 31,			December 31,
(In thousands)	2026			2025
Opco Credit Facility	$	46,084		$	18,884
Opco Senior Notes
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026	$	11,420		$	11,420
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026		2,911			2,911
Total Opco Senior Notes	$	14,331		$	14,331
Total debt at face value	$	60,415		$	33,215
Net unamortized debt issuance costs		(97	)		(133	)
Total debt, net	$	60,318		$	33,082
Less: current portion of debt		(14,234	)		(14,198	)
Total long-term debt, net	$	46,084		$	18,884

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Note 9 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Fair Value Option, Disclosures [Table Text Block]

			March 31, 2026				December 31, 2025
	Fair Value		Carrying		Estimated		Carrying		Estimated
(In thousands)	Hierarchy Level		Value		Fair Value		Value		Fair Value
Assets:
Contract receivable, net (current and long-term) (1)		3	$	22,734	$	20,233	$	23,480	$	20,792
Debt:
Opco Senior Notes (2)		3	$	14,234	$	14,025	$	14,198	$	14,018
Opco Credit Facility (3)		3		46,084		46,084		18,884		18,884

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Note 10 - Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Related Party Transactions [Table Text Block]

	For the Three Months Ended March 31,
(In thousands)	2026		2025
Operating and maintenance expenses	$	1,622	$	1,793
General and administrative expenses		1,566		1,569

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Note 11 - Major Customers (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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

	For the Three Months Ended March 31,
	2026					2025
(In thousands)	Revenues		Percent			Revenues		Percent
Alpha Metallurgical Resources, Inc. (1)	$	13,701		29	%	$	13,176		24	%
Foresight Energy Resources LLC ("Foresight") (1)	$	13,497		29	%	$	16,460		30	%
Alabama Kanu Holdings, LLC (1)	$	4,730		10	%	$	3,258		6	%

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Note 13 - Unit-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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, 2026		266		$	78.68
Granted		65		$	132.29
Fully vested and issued		(155	)	$	65.19
Outstanding at March 31, 2026		176		$	110.54

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Note 14 - Credit Losses (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

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

	March 31, 2026							December 31, 2025
(In thousands)	Gross		CECL Allowance			Net		Gross		CECL Allowance			Net
Receivables	$	35,431	$	(3,565	)	$	31,866	$	36,178	$	(4,183	)	$	31,995
Long-term contract receivable		20,301		(703	)		19,598		21,138		(732	)		20,406
Total	$	55,732	$	(4,268	)	$	51,464	$	57,316	$	(4,915	)	$	52,401

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Note 1 - Basis of Presentation (Details Textual)	3 Months Ended
	Mar. 31, 2026
Number of Operating Segments	2
Number of Wholly Owned Operating Companies	1
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49.00%

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Note 2 - Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - Mineral Rights Segment [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Segments [Member]
Revenue from contract with customers	$ 46,705	$ 55,145
Coal Royalty Revenues [Member]
Revenue from contract with customers	29,574	35,498
Production Lease Minimum Revenues [Member]
Revenue from contract with customers	558	2,725
Minimum Lease Straight-line Revenues [Member]
Revenue from contract with customers	4,019	4,050
Oil and Gas Royalty Revenues [Member]
Revenue from contract with customers	1,386	2,444
Carbon Neutral Revenues [Member]
Revenue from contract with customers	185	595
Property Tax Revenues [Member]
Revenue from contract with customers	1,711	1,637
Wheelage Revenues [Member]
Revenue from contract with customers	1,990	1,738
Coal Overriding Royalty Revenues [Member]
Revenue from contract with customers	1,386	880
Lease Amendment Revenues [Member]
Revenue from contract with customers	1,200	655
Aggregates Royalty Revenues [Member]
Revenue from contract with customers	1,118	853
Other Revenues [Member]
Revenue from contract with customers	170	185
Royalty and Other Mineral Rights [Member]
Revenue from contract with customers	43,297	51,260
Transportation and Processing Services [Member]
Revenue from contract with customers	$ 3,408	$ 3,885

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Note 2 - Revenues from Contracts with Customers - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounts receivable, net	$ 26,792		$ 28,666
Accounts payable	2,448		1,159
Current portion of deferred revenue	7,029		6,663
Deferred revenue	59,136		58,067
Balance	64,730	$ 60,155
Increase due to minimums and lease amendment fees	10,942	5,861
Recognition of previously deferred revenue	(9,507)	(9,088)
Balance	66,165	$ 56,928
Coal Royalty Revenues [Member]
Accounts receivable, net	22,422		24,372
Contract with customer, current	0		84
Contract with customer, noncurrent	7,234		5,281
Accounts payable	125		211
Current portion of deferred revenue	7,029		6,663
Deferred revenue	$ 59,136		$ 58,067

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Note 2 - Revenues from Contracts with Customers - Operating Lease Payments Receivable (Details) $ in Thousands	Mar. 31, 2026 USD ($)	[1]
Weighted average remaining years (Year)	7 years
Annual minimum payments	$ 55,071
Lease Term, 0 to 5 Years [Member]
Weighted average remaining years (Year)	2 years 1 month 6 days
Annual minimum payments	$ 13,269
Lease Term, 5 to 10 Years [Member]
Weighted average remaining years (Year)	6 years 2 months 12 days
Annual minimum payments	$ 15,493
Lease Term, Greater Than 10 Years [Member]
Weighted average remaining years (Year)	10 years
Annual minimum payments	$ 26,309

[1] Lease term does not include renewal periods.

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Note 3 - Common Unit Distributions (Details Textual)	3 Months Ended
	Mar. 31, 2026
Partner, General [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	2.00%

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Note 3 - Common Unit Distributions - Distributions Made to Partners (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Distributions, common units		$ 11,763	$ 26,276
Common Unitholders, General Partner [Member]
Distribution per unit, common units (in dollars per share)		$ 0.75	$ 0.75
Distributions, common units	[1]	$ 10,141	$ 10,055
Common Unitholders, General Partner [Member] | March 2026 Special Distribution [Member]
Distribution per unit, common units (in dollars per share)	[2]	$ 0.12
Distributions, common units	[1],[2]	$ 1,622
Common Unitholders, General Partner [Member] | March 2025 Special Distribution [Member]
Distribution per unit, common units (in dollars per share)	[3]		$ 1.21
Distributions, common units	[1],[3]		$ 16,221

[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 2025.

[3] Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2024.

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Note 4 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net income attributable to common unitholders	$ 19,227	$ 39,448
Weighted average common units—basic (in shares)	13,199	13,098
Basic net income per common unit (in dollars per share)	$ 1.46	$ 3.01
Plus: dilutive effect of unvested unit-based awards (in shares)	151	206
Weighted average common units—diluted (in shares)	13,350	13,304
Diluted net income attributable to common unitholders and the general partner	$ 19,619	$ 40,253
Less: diluted net income attributable to the general partner	(392)	(805)
Diluted net income attributable to common unitholders	$ 19,227	$ 39,448
Diluted net income per common unit (in dollars per share)	$ 1.44	$ 2.97

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Note 5 - Segment Information (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)
Number of Operating Segments	2
Share-Based Payment Arrangement, Noncash Expense	$ 1,164	$ 2,717
Interest Income, Operating and Nonoperating	$ 200	200
Number of Reportable Segments	2
Mineral Rights Segment [Member]
Share-Based Payment Arrangement, Noncash Expense	$ 100	300
Cash Compensation	100	100
Corporate & Financing Segment [Member]
Share-Based Payment Arrangement, Noncash Expense	800	2,200
Cash Compensation	$ 100	$ 100
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49.00%

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Note 5 - Segment Information - Information By Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026		Mar. 31, 2025		Dec. 31, 2025
Revenues		$ 47,182		$ 55,681
Equity in earnings of Sisecam Wyoming		(7,828)		4,610
Gain on asset sales and disposals		(1)		247
Total revenues and other income		39,353		60,538
Compensation (salaries, benefits and bonus)		3,861		4,047
Long-term incentive compensation (1)		1,169	[1]	2,725	[2]
Property taxes		1,879		1,792
Depreciation, Depletion and Amortization		7,614		3,989
Asset impairments		0		20
Interest expense, net (2)	[3]	973		2,668
Other segment items (3)	[4]	4,238		5,044
Net income (loss)		19,619		40,253
Total assets		771,657		748,365		$ 748,365
Operating Segments [Member]
Revenues		47,182		55,681
Equity in earnings of Sisecam Wyoming		(7,828)		4,610
Gain on asset sales and disposals		(1)		247
Total revenues and other income		39,353		60,538
Compensation (salaries, benefits and bonus)		1,797		1,938
Long-term incentive compensation (1)		262	[1]	464	[2]
Property taxes		1,879		1,792
Depreciation, Depletion and Amortization		7,610		3,985
Asset impairments		0		20
Interest expense, net (2)	[3]	0		0
Other segment items (3)	[4]	2,175		2,581
Net income (loss)		25,630		49,758
Total assets		766,466		742,916
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues		0		0
Equity in earnings of Sisecam Wyoming		0		0
Gain on asset sales and disposals		0		0
Total revenues and other income		0		0
Compensation (salaries, benefits and bonus)		2,064		2,109
Long-term incentive compensation (1)		907	[1]	2,261	[2]
Property taxes		0		0
Depreciation, Depletion and Amortization		4		4
Asset impairments		0		0
Interest expense, net (2)	[3]	973		2,668
Other segment items (3)	[4]	2,063		2,463
Net income (loss)		(6,011)		(9,505)
Total assets		5,191		5,449
Mineral Rights Segment [Member]
Depreciation, Depletion and Amortization		6,100		3,700
Mineral Rights Segment [Member] | Operating Segments [Member]
Revenues		47,182		55,681
Equity in earnings of Sisecam Wyoming		0		0
Gain on asset sales and disposals		(1)		247
Total revenues and other income		47,181		55,928
Compensation (salaries, benefits and bonus)		1,797		1,938
Long-term incentive compensation (1)		262	[1]	464	[2]
Property taxes		1,879		1,792
Depreciation, Depletion and Amortization		7,610		3,985
Asset impairments		0		20
Interest expense, net (2)	[3]	0		0
Other segment items (3)	[4]	2,103		2,521
Net income (loss)		33,530		45,208
Total assets		484,989		492,672
Soda Ash Segment [Member] | Operating Segments [Member]
Revenues		0		0
Equity in earnings of Sisecam Wyoming		(7,828)		4,610
Gain on asset sales and disposals		0		0
Total revenues and other income		(7,828)		4,610
Compensation (salaries, benefits and bonus)		0		0
Long-term incentive compensation (1)		0	[1]	0	[2]
Property taxes		0		0
Depreciation, Depletion and Amortization		0		0
Asset impairments		0		0
Interest expense, net (2)	[3]	0		0
Other segment items (3)	[4]	72		60
Net income (loss)		(7,900)		4,550
Total assets		$ 281,477		$ 250,244

[1] Long-term incentive compensation for the three months ended March 31, 2026 includes (1) Mineral Rights segment: $0.1 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $0.8 million of equity compensation and $0.1 million of cash compensation.

[2] Long-term incentive compensation for the three months ended March 31, 2025 includes (1) Mineral Rights segment: $0.3 million of equity compensation and $0.1 million of cash compensation; (2) Corporate & Financing segment: $2.2 million of equity compensation and $0.1 million of cash compensation.

[3] Included in interest expense, net was $0.2 million of interest income for both the three months ended March 31, 2026 and 2025.

[4] Other segment items in the Mineral Rights segment primarily include: insurance, legal, overriding royalty expense, processing and transportation expense, information technology, shared facility services, rent, professional fees and bad debt expense. Other segment items in the Soda Ash segment primarily include professional fees. Other segment items in the Corporate and Financing segment primarily include: insurance, legal, information technology, shared facility services, rent and professional fees.

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Note 6 - Equity Investment (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Payments to Acquire Equity Method Investments	$ 39,200	$ (0)
Sisecam Wyoming [Member]
Equity Method Investment, Ownership Percentage	49.00%
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 1,600	1,300
Payments to Acquire Equity Method Investments	$ 39,200	$ 0

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Note 6 - Equity Investment - Investment Activity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Beginning Balance		$ 250,244
Payments to Acquire Equity Method Investments		39,200	$ (0)
Ending Balance		281,477
Net income		19,619	40,253
Sisecam Wyoming [Member]
Net sales		127,335	153,309
Gross profit (loss)		(4,731)	19,033
Net income		(13,667)	11,764
Sisecam Wyoming [Member]
Beginning Balance		250,244	257,355
Income (loss) allocation to NRP’s equity interests (1)	[1]	(6,697)	5,764
Amortization of basis difference		(1,130)	(1,153)
Payments to Acquire Equity Method Investments		39,200	0
Other comprehensive income (loss)		(140)	2,260
Distributions		0	(2,940)
Ending Balance		$ 281,477	$ 261,286

[1] Amounts reclassified into income (loss) out of accumulated other comprehensive loss were $1.6 million and $1.3 million for the three months ended March 31, 2026 and 2025, respectively.

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Note 7 - Mineral Rights, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Depreciation, Depletion and Amortization	$ 7,614	$ 3,989
Mineral Rights Segment [Member]
Depreciation, Depletion and Amortization	$ 6,100	$ 3,700

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Note 7 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Mineral Properties, carrying value	$ 687,959	$ 687,959
Mineral Properties, accumulated depletion	(327,099)	(320,972)
Mineral Properties, net book value	360,860	366,987
Coal Properties [Member]
Mineral Properties, carrying value	653,808	653,808
Mineral Properties, accumulated depletion	(310,427)	(304,412)
Mineral Properties, net book value	343,381	349,396
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(4,439)	(4,364)
Mineral Properties, net book value	4,216	4,291
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,621)	(10,584)
Mineral Properties, net book value	1,733	1,770
Other [Member]
Mineral Properties, carrying value	13,142	13,142
Mineral Properties, accumulated depletion	(1,612)	(1,612)
Mineral Properties, net book value	$ 11,530	$ 11,530

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Note 8 - Debt, Net (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Nontrade Receivables, Noncurrent	$ 19,598		$ 20,406
Long-Term Debt, Gross	60,415		33,215
Floating Rate Revolving Credit Facility Due October 2029 [Member] | Opco [Member]
Long-Term Line of Credit	46,100		18,900
Line of Credit Facility, Remaining Borrowing Capacity	153,900		181,100
Proceeds from Lines of Credit	61,200	$ 33,700
Repayments of Lines of Credit	$ 34,000	$ 37,000
Long-Term Debt, Weighted Average Interest Rate, over Time	7.28%	7.93%
Debt Instrument, Collateral Amount	$ 284,800		290,600
Nontrade Receivables, Noncurrent	19,600		20,400
Long-Term Debt, Gross	$ 46,084		$ 18,884
Floating Rate Revolving Credit Facility Due October 2029 [Member] | Opco [Member] | New Lender [Member]
Debt Instrument Covenant Maximum Leverage Ratio	0.4		3
Debt Instrument, Covenant, Minimum Interest Coverage Ratio	21.4		3.5
Senior Notes [Member] | Opco [Member]
Long-Term Debt, Gross	$ 14,300		$ 14,300

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Note 8 - Debt, Net - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt instrument, carrying value	$ 60,415	$ 33,215
Net unamortized debt issuance costs	(97)	(133)
Total debt, net	60,318	33,082
Less: current portion of debt	(14,234)	(14,198)
Total long-term debt, net	46,084	18,884
Senior Notes [Member] | Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	11,420	11,420
Senior Notes [Member] | Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	2,911	2,911
Opco Senior Notes [Member]
Debt instrument, carrying value	14,331	14,331
Opco [Member] | Floating Rate Revolving Credit Facility Due October 2029 [Member]
Debt instrument, carrying value	46,084	18,884
Opco [Member] | Senior Notes [Member]
Debt instrument, carrying value	$ 14,300	$ 14,300

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Note 9 - Fair Value Measurements (Details Textual)	Mar. 31, 2026	Dec. 31, 2025
Discount Rate	15.00%	15.00%

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Note 9 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands		Mar. 31, 2026	Dec. 31, 2025
Reported Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	$ 22,734	$ 23,480
Reported Value Measurement [Member] | Opco Senior Notes [Member]
Long term debt, fair value	[2]	14,234	14,198
Reported Value Measurement [Member] | Floating Rate Revolving Credit Facility Due October 2029 [Member]
Long term debt, fair value	[3]	46,084	18,884
Estimate of Fair Value Measurement [Member]
Contract receivable, net (current and long-term)	[1]	20,233	20,792
Estimate of Fair Value Measurement [Member] | Opco Senior Notes [Member]
Long term debt, fair value	[2]	14,025	14,018
Estimate of Fair Value Measurement [Member] | Floating Rate Revolving Credit Facility Due October 2029 [Member]
Long term debt, fair value	[3]	$ 46,084	$ 18,884

[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 March 31, 2026 and December 31, 2025.

[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 the debt at any time without penalty.

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Note 10 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounts Payable, Current	$ 2,448		$ 1,159
Other Assets, Noncurrent	15,568		13,900
Affiliated Entity [Member]
Accounts Payable, Current	600		700
WPPLP [Member]
Accounts Payable, Current	1,200		100
Other Assets, Current	100		200
Operating Lease, Liability	3,400		3,400
Operating Costs and Expenses	1,200	$ 100
Other Assets, Noncurrent	1,100		1,100
Operating Lease, Right-of-Use Asset	$ 3,400		$ 3,400

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Note 10 - Related Party Transactions - General Partner Affiliates (Details) - QMC and WPPLP and QID [Member] - Affiliated Entity [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Costs and Expenses	$ 1,622	$ 1,793
General and administrative expenses	$ 1,566	$ 1,569

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Note 11 - Major Customers - Concentration Risk (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Alpha Metallurgical Resources [Member]
Net sales	[1]	$ 13,701	$ 13,176
Alpha Metallurgical Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent	[1]	29.00%	24.00%
Foresight Energy Resources [Member]
Net sales	[1]	$ 13,497	$ 16,460
Foresight Energy Resources [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent	[1]	29.00%	30.00%
Alabama Kanu Holdings [Member]
Net sales	[1]	$ 4,730	$ 3,258
Alabama Kanu Holdings [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenue, percent	[1]	10.00%	6.00%

[1] Revenues from Alpha Metallurgical Resources, Inc., Foresight, and Alabama Kanu Holdings, LLC are generated in the United States of America and are included within the Partnership's Mineral Rights segment.

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Note 13 - Unit-Based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value	$ 8.6	$ 6.8
Share-Based Payment Arrangement, Expense	1.2	2.7
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 11.9		$ 5.9
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 3 months 18 days
Payment, Tax Withholding, Share-Based Payment Arrangement	$ 8.9	5.5
Market-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value	$ 3.1	$ 2.5

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Note 13 - Unit-Based Compensation - Share-based Compensation Activity (Details) - Common Units [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Outstanding (in shares) | shares	266
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 78.68
Granted (in shares) | shares	65
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 132.29
Fully vested and issued (in shares) | shares	(155)
Fully vested and issued, weighted average grant date fair value (in dollars per share) | $ / shares	$ 65.19
Outstanding (in shares) | shares	176
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 110.54

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Note 14 - Credit Losses (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Credit Loss, Expense (Reversal)	$ (0.6)	$ (0.3)

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Note 14 - Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Receivables, gross	$ 35,431	$ 36,178
Receivables, allowance	(3,565)	(4,183)
Receivables, net	31,866	31,995
Long-term contract receivable, gross	20,301	21,138
Long-term contract receivable, allowance	(703)	(732)
Long-term contract receivable, net	19,598	20,406
Total, gross	55,732	57,316
Total, allowance	(4,268)	(4,915)
Total, net	$ 51,464	$ 52,401

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Note 15 - Subsequent Events (Details Textual)	May 01, 2026 $ / shares
Subsequent Event [Member] | Common Unitholders, General Partner [Member]
Distribution Made to Limited Partner, Distributions Declared, Per Unit (in dollars per share)	$ 0.75