Discontinued Operations - Selected Statements of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from discontinued operating activities:    
Net income from discontinued operations, net of income taxes $ 10,690 $ 300
Changes in operating assets and liabilities:    
Net cash provided by discontinued operating activities 14,184 (2,705)
Cash flows from discontinued investing activities:    
Net cash used in discontinued investing activities (6,488) (22,538)
Cash flows from discontinued financing activities:    
Cash transferred from Gold Resource Corporation at Spin-Off (27,774)  
Fortitude Gold Corporation and Subsidiaries | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff    
Cash flows from discontinued operating activities:    
Net income from discontinued operations, net of income taxes 10,690 300
Adjustments to reconcile net income to net cash from discontinued operating activities:    
Deferred income benefit (224) (917)
Depreciation and amortization 10,377 4,022
Other operating adjustments 48 17
Changes in operating assets and liabilities:    
Accounts receivable (145)  
Inventories (2,300) (6,490)
Prepaid expenses and other current assets (1,670) 346
Other non-current assets (2,085) (3,600)
Accounts payable and other accrued liabilities (1,707) 3,617
Mining royalty and income taxes payable, net 1,200  
Net cash provided by discontinued operating activities 14,184 (2,705)
Cash flows from discontinued investing activities:    
Capital expenditures (6,488) (22,538)
Net cash used in discontinued investing activities (6,488) (22,538)
Cash flows from discontinued financing activities:    
Repayment of finance leases (452) (2,019)
Net cash provided (to) by discontinued financing activities (452) (2,019)
Non-cash investing activities:    
Change in capital expenditures in accounts payable (1,544) (1,174)
Change in estimate for asset retirement costs $ 1,159 $ 1,726