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Note 7 - Income and Mining Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Liabilities, Net, Total | $ 104,144 | $ 153,179 |  |
Deferred Tax Assets, Valuation Allowance, Total | $ 39,152 | 77,210 | $ 86,634 | $ 94,981
Operating Loss Carryforwards Expiration Period (Year) | 20 years |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 0 | 0 |  |
Nevada Operations [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 19,400 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Tax Credit Carryforward, Valuation Allowance | 8,900 |  |  |
Operating Loss Carryforwards, Total | 69,700 |  |  |
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 7,700 |  |  |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 3,200 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards, Total | 869,200 |  |  |
Operating Loss Carryforwards, Indefinite Carryforward Period | 381,200 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards, Total | 470,600 |  |  |
Decrease Related to Release of Valuation Allowance [Member] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (58,400) |  |  |
Klondex Mines Ltd [Member] |  |  |  |
Deferred Tax Liabilities, Net, Total |  | $ 55,200 |  |

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