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Income Taxes (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income tax expense $ 2,352,000 $ 2,931,000 $ 6,697,000 $ (420,000)
Effective tax rate     21.00%  
Mining duty over sales of gold and silver     0.50%  
Withholding tax on dividends     10.00%  
Dividend withholding tax between countries     5.00%  
Liability for uncertain tax positions $ 0   $ 0  
GILTI Effective Tax Rate Above U.S. Tax Rate     90.00%  
GILTI Effective Tax Rate Percent Above U.S. Tax Rate     18.90%  
Mexico        
MITL corporate income tax rate 37.50%   37.50%  
MITL corporate income tax rate excluding mining tax     30.00%  
Mining tax rate     7.50%  
Prior MITL Deductable Percentage     100.00%  
Exploration Expense Maximum Annual Deductable Percentage     10.00%  
Exploration Expense Period     10 years  
CANADA        
Canada income tax rate 26.50%   26.50%