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Note 13 - Derivatives (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Derivative, Gain (Loss) on Derivative, Net, Total $ (65) $ (147,306) $ (256,571) $ (167,743)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total 81,246 (147,306) (15,085) (167,743)
Coal Contract [Member]        
Derivative, Gain (Loss) on Derivative, Net, Total 81,311   241,486  
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total $ 81,246 $ 147,306 $ 15,085 $ 167,743