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Note 11 - Revenue (Tables) | 12 Months Ended
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Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands) |  | ​ | ​ | 2022 |  | 2021 |  | 2020
Coal Sales |  | ​ | ​ | ​ |  |  | ​ |  |  | ​ |
North American revenue | ​ | ​ | ​ | $ | 328,322 | ​ | $ | 143,946 | ​ | $ | 119,981
Export revenue, excluding Canada | ​ | ​ | ​ |  | 237,366 | ​ |  | 139,448 | ​ |  | 48,934
Total revenue | ​ | ​ | ​ | $ | 565,688 | ​ | $ | 283,394 | ​ | $ | 168,915
​

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 + Details
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