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v3.25.1

Note 12 - Major Customers (Tables) | 3 Months Ended
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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 | %

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