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Note 6 - Income and Mining Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax liabilities | $ 104,741 | $ 104,144 |  |
Deferred tax assets, valuation allowance | 72,856 | 39,152 | $ 77,210 | $ 86,634
Tax Credit Carryforwards | 2,900 |  |  |
Income Tax Expense (Benefit) | 7,566 | 29,569 | $ (8,199) |
Unrecognized tax benefits | 0 | 0 |  |
Tax credit Carryforward, Amount | 13,700 |  |  |
Mexican Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 10,100 |  |  |
Nevada Operations [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 28,900 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards | 262,500 |  |  |
Tax credit Carryforward, Amount | $ 2,500 |  |  |
Tax credit carryforward term | 10 years |  |  |
Tax credit carryforward, limitations on use | Our foreign tax credits will expire between 2023 and 2026. |  |  |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | $ 28,800 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax credit carryforward, valuation allowance | 5,100 |  |  |
Tax Credit Carryforwards | 500 |  |  |
Operating loss carryforwards | 873,500 | $ 437,600 |  |
Operating loss carryforwards, Indefinite period | 372,800 |  |  |
Tax credit Carryforward, Amount | 2,400 |  |  |
Alexco Resource Corp Member |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Valuation allowance, deferred tax asset | $ 25,600 |  |  |

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