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Long-term Reclamation Liability and Retirement Obligation Asset - Narrative (Details) - USD ($)
12 Months Ended
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Regulatory Assets [Line Items]        
Accrued long-term liability   $ 6,054,919 $ 6,034,208 $ 7,441,091
Amount reclassified to liabilities held for sale   0 1,019,705  
Accretion of reclamation liability   20,711 22,840  
Amortization of retirement obligation asset   57,963 67,758  
Reduction of obligation $ 400,000 $ 0 $ 410,018  
Industrial Park (Land and water rights) | Nevada Division of Environmental Protection        
Regulatory Assets [Line Items]        
Accrued long-term liability $ 6,800,000