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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% |

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