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Note 7 - Income and Mining Taxes - Schedule of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Line Items] |  |  |
Balance at beginning of year | $ (72,856) | $ (39,152) | $ (77,210)
Balance at end of year | (100,910) | (72,856) | (39,152)
Increase Due to Uncertainty of Recovery [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | (21,114) | (13,256) | (20,304)
Decrease Related to Utilization and Expiration [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | 1,137 | 5,143 | 58,362
Klondex Mines Ltd [Member] | Business Acquisition [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | $ (8,077) | $ (25,591) | $ 0

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- Definition Income Tax Disclosure [Line Items] + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Details
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