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Note 7 - Income and Mining Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax liabilities | $ 110,266 | $ 101,952 |  |
Deferred tax assets, valuation allowance | 115,105 | 100,910 | $ 72,856 | $ 39,152
Unrecognized tax benefits | 0 | 0 |  |
Mexican Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 11,600 |  |  |
Nevada Operations [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 39,200 |  |  |
Deferred tax assets, tax credit carryforwards | 5,800 |  |  |
Tax credit carryforward, amount | 27,500 |  |  |
Foreign Tax Jurisdiction [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards | 183,000 |  |  |
Tax credit carryforward, amount | $ 1,600 |  |  |
Tax credit carryforward term | 10 years |  |  |
Tax credit carryforward, limitations on use | Our foreign tax credits will expire between 2025 and 2026. |  |  |
Domestic Tax Jurisdiction [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax credit carryforward, valuation allowance | $ 3,400 |  |  |
Deferred tax assets, tax credit carryforwards | 900 |  |  |
Operating loss carryforwards | 818,100 | $ 318,200 |  |
Operating loss carryforwards, Indefinite period | 468,300 |  |  |
Tax credit carryforward, amount | 4,700 |  |  |
Alexco Resource Corp Member |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 60,900 |  |  |
Deferred tax assets, tax credit carryforwards | 4,400 |  |  |
Tax credit carryforward, amount | $ 16,400 |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that has an indefinite carryforward period. + References No definition available. + Details
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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