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Long-term Reclamation Liability and Retirement Obligation Asset (Details) - USD ($)
12 Months Ended
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Regulatory Assets [Line Items]        
Long-term liability, inclusive of held-for-sale   $ 7,100,000    
Accrued long-term liability   6,034,208 $ 7,441,091 $ 7,417,680
Amount reclassified to liabilities held for sale   1,019,705 0  
Total liabilities held for sale   1,019,705 0  
Accretion of reclamation liability and amortization of retirement obligation   100,000 100,000 $ 400,000
Reduction of obligation $ 400,000 $ 410,018 $ 0  
Lucerne Properties (mineral claims) | Nevada Division of Environmental Protection        
Regulatory Assets [Line Items]        
Accrued long-term liability $ 6,800,000