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Note 6 - Income and Mining Taxes - Schedule of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |
Balance at beginning of year | $ (39,152) | $ (77,210) | $ (86,634)
Balance at end of year | (72,856) | (39,152) | (77,210)
Increase Due to Uncertainty of Recovery [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | (13,256) | (20,304) | 786
Decrease Related to Utilization and Expiration [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | 5,143 | 58,362 | 8,638
Klondex Mines Ltd [Member] | Business Acquisition [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Valuation allowance, deferred tax asset | $ 25,591 | $ 0 | $ 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Details
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