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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Income Taxes          
Federal tax rate     21.00%    
Minerals tax rate     5.00%    
Mining and income tax expense $ 1,423 $ 2,553 $ 1,849 $ 3,531  
Valuation allowance 0   0   $ 0
Uncertain tax positions $ 0   $ 0