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Note 7 - Income and Mining Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax liabilities | $ 101,952 | $ 104,741 |  |
Deferred tax assets, valuation allowance | 100,910 | 72,856 | $ 39,152 | $ 77,210
Deferred tax assets, tax credit carryforwards | 4,300 |  |  |
Unrecognized tax benefits | 0 | 0 |  |
Tax credit carryforward, amount | 20,600 |  |  |
Mexican Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 13,200 |  |  |
Nevada Operations [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 35,100 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards | 188,500 |  |  |
Tax credit carryforward, amount | $ 2,000 |  |  |
Tax credit carryforward term | 10 years |  |  |
Tax credit carryforward, limitations on use | Our foreign tax credits will expire between 2024 and 2026. |  |  |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax credit carryforward, valuation allowance | $ 4,300 |  |  |
Deferred tax assets, tax credit carryforwards | 700 |  |  |
Operating loss carryforwards | 893,600 | $ 418,000 |  |
Operating loss carryforwards, Indefinite period | 408,200 |  |  |
Tax credit carryforward, amount | 3,400 |  |  |
Alexco Resource Corp Member |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | $ 48,300 |  |  |

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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