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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income tax (benefit) expense $ 1,974,000 $ 2,417,000 $ (833,000) $ 4,949,000
Effective tax rate     21.00%  
MITL corporate income tax rate 37.50%   37.50%  
MITL corporate income tax rate excluding mining tax     30.00%  
Mining tax rate     7.50%  
Minerals Tax Rate     5.00%  
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%  
Global Intangible Low Taxed Income [Member]        
Income tax (benefit) expense $ 900,000