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Note 12 - Major Customers (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

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

		For the Three Months Ended March 31,
		2025								2024
(In thousands)		Revenues				Percent				Revenues				Percent
Alpha Metallurgical Resources, Inc. (1)		$	13,176				24	%		$	20,902				27	%
Foresight Energy Resources LLC ("Foresight") (1)		$	16,460				30	%		$	12,846				17	%

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

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- References

No definition available.

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