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Discontinued Operations - Results of discontinued operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net income from discontinued operations, net of income taxes $ 10,690 $ 300
Fortitude Gold Corporation and Subsidiaries | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Sales, net 53,967 15,065
Mine cost of sales (37,784) (14,582)
Mine gross profit 16,183 483
Exploration expenses (2,649) (932)
Other expense, net (838) (168)
Profit (loss) before income taxes 12,696 (617)
Income tax expense (benefit) 2,006 (917)
Net income from discontinued operations, net of income taxes $ 10,690 $ 300