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Note 14 - Major Customers (Tables) | 12 Months Ended
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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 | %

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