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Note 9 - Mineral Rights, Net (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Mineral Properties Disclosure [Table Text Block]

		December 31,
		2024												2023
(In thousands)		Carrying Value				Accumulated Depletion				Net Book Value				Carrying Value				Accumulated Depletion				Net Book Value
Coal properties		$	660,961			$	(299,404	)		$	361,557			$	661,256			$	(285,470	)		$	375,786
Aggregates properties			8,655				(4,065	)			4,590				8,655				(3,761	)			4,894
Oil and gas royalty properties			12,354				(10,394	)			1,960				12,354				(10,082	)			2,272
Other			13,143				(1,612	)			11,531				13,143				(1,612	)			11,531
Total mineral rights, net		$	695,113			$	(315,475	)		$	379,638			$	695,408			$	(300,925	)		$	394,483

Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]

		For the Year Ended December 31,
(In thousands)		2024				2023				2022
Coal properties (1)		$	87			$	556			$	4,365
Aggregates properties			—				—				92
Total		$	87			$	556			$	4,457

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