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Note 8 - Mineral Rights, Net (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Mineral Properties Disclosure [Table Text Block]

		*September 30, 2023*												*December 31, 2022*
(In thousands)		*Carrying Value*				*Accumulated Depletion*				*Net Book Value*				*Carrying Value*				*Accumulated Depletion*				*Net Book Value*
Coal properties		$	661,680			$	(279,988	)		$	381,692			$	661,812			$	(269,037	)		$	392,775
Aggregates properties			8,655				(3,723	)			4,932				8,655				(3,410	)			5,245
Oil and gas royalty properties			12,354				(9,962	)			2,392				12,354				(9,600	)			2,754
Other			13,144				(1,612	)			11,532				13,150				(1,612	)			11,538
Total mineral rights, net		$	695,833			$	(295,285	)		$	400,548			$	695,971			$	(283,659	)		$	412,312