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Note 8 - Mineral Rights, Net (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Mineral Properties Disclosure [Table Text Block]

		*March 31, 2025*												*December 31, 2024*
(In thousands)		*Carrying Value*				*Accumulated Depletion*				*Net Book Value*				*Carrying Value*				*Accumulated Depletion*				*Net Book Value*
Coal properties		$	653,808			$	(294,522	)		$	359,286			$	660,961			$	(299,404	)		$	361,557
Aggregates properties			8,655				(4,139	)			4,516				8,655				(4,065	)			4,590
Oil and gas royalty properties			12,354				(10,441	)			1,913				12,354				(10,394	)			1,960
Other			13,142				(1,612	)			11,530				13,143				(1,612	)			11,531
Total mineral rights, net		$	687,959			$	(310,714	)		$	377,245			$	695,113			$	(315,475	)		$	379,638