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Note 11 - Revenue - Domestic Revenues an Export Revenues (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) $ / T | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
REVENUES |  |  |  |
Revenues | $ 565,688 | $ 283,394 | $ 168,915 | $ 168,915
CANADA |  |  |  |
REVENUES |  |  |  |
Percentage of Sales | 12.00% |  |  |
SOUTH AFRICA |  |  |  |
REVENUES |  |  |  |
Percentage of Sales | 10.00% |  |  |
Domestic Coal Revenues |  |  |  |
REVENUES |  |  |  |
Revenues | $ 328,322 | 143,946 |  | 119,981
Export Revenues |  |  |  |
REVENUES |  |  |  |
Revenues | $ 237,366 | $ 139,448 |  | $ 48,934
Percentage of Sales | 10.00% |  |  |
Fixed Priced Contracts |  |  |  |
REVENUES |  |  |  |
Average per ton | $ / T | 202 |  |  |

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