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Note 8 - Revenue (Tables) | 3 Months Ended
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Mar. 31, 2024
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, | ​
(In thousands) |  | 2024 |  | 2023 | ​
Coal Sales |  | ​ |  |  | ​ |  | ​
North American revenue | ​ | $ | 54,173 | ​ | $ | 40,027 | ​
Export revenue, excluding Canada | ​ |  | 118,503 | ​ |  | 126,333 | ​
Total revenue | ​ | $ | 172,676 | ​ | $ | 166,360 | ​

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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