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Note 14 - Major Customers (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

		For the Year Ended December 31,
		2024								2023								2022
(In thousands)		Revenues				Percent				Revenues				Percent				Revenues				Percent
Alpha Metallurgical Resources, Inc. (1)		$	67,714				28	%		$	86,118				23	%		$	102,352				26	%
Foresight (1)		$	39,178				16	%		$	60,495				16	%		$	65,597				17	%
Alabama Kanu Holdings, LLC (1) (2)		$	29,533				12	%		$	34,869				9	%		$	24,596				6	%

X

- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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