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Note 3 - Revenues From Contracts With Customers (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Disaggregation of Revenue [Table Text Block]

		*For the Year Ended December 31,*
(In thousands)		*2024*				*2023*				*2022*
Coal royalty revenues		$	159,033			$	218,011			$	226,956
Production lease minimum revenues			4,365				3,322				5,854
Minimum lease straight-line revenues			16,530				19,389				18,792
Carbon neutral revenues ⁽¹⁾			15,703				2,969				8,600
Property tax revenues			7,100				6,219				5,878
Wheelage revenues			9,324				12,191				13,961
Coal overriding royalty revenues			2,358				2,175				3,434
Lease amendment revenues			3,724				3,070				3,201
Aggregates royalty revenues			2,904				2,876				3,299
Oil and gas royalty revenues			8,566				7,387				16,161
Other revenues			2,744				1,124				877
Royalty and other mineral rights revenues		$	232,351			$	278,733			$	307,013
Transportation and processing services revenues			8,597				12,411				17,876
Total Mineral Rights segment revenues from contracts with customers		$	240,948			$	291,144			$	324,889

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

		*December 31,*
(In thousands)		*2024*				*2023*
Receivables
Accounts receivable, net		$	27,358			$	37,206
Other current assets, net ⁽¹⁾			—				429
Other long-term assets, net ⁽²⁾			2,352				—

Contract liabilities
Accounts payable ⁽³⁾		$	125			$	—
Current portion of deferred revenue			4,341				4,599
Deferred revenue			55,814				38,356

		*For the Year Ended December 31,*
(In thousands)		*2024*				*2023*				*2022*
Balance at beginning of period (current and non-current)		$	42,955			$	46,437			$	61,862
Increase due to minimums and lease amendment fees			32,960				17,526				19,073
Recognition of previously deferred revenue			(15,760	)			(21,008	)			(34,498	)
Balance at end of period (current and non-current)		$	60,155			$	42,955			$	46,437

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

Lease Term ⁽¹⁾		*Weighted Average Remaining Years*				*Annual Minimum Payments*
0 - 5 years			2.3			$	13,478
5 - 10 years			5.4				17,477
10+ years			11.2				26,309
Total			7.3			$	57,264