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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 11 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Tax Liabilities, Net, Total |  | $ 129,563 | $ 134,745 |  |
Income Tax Expense (Benefit), Total |  | 135 | (24,101) | $ (6,701) |
Deferred Tax Assets, Valuation Allowance, Total |  | $ 77,210 | 86,634 | $ 94,981 | $ 78,684
Operating Loss Carryforwards Expiration Period (Year) |  | 20 years |  |  |
Unrecognized Tax Benefits, Ending Balance |  | $ 0 | 0 |  |
Domestic Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 72,500 |  |  |
Operating Loss Carryforwards, Total |  | 788,200 |  |  |
Operating Loss Carryforwards, Indefinite Carryforward Period |  | 292,900 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  | 53,500 |  |  |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 2,600 |  |  |
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 2,100 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  | 477,900 |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total |  | 59,500 |  |  |
Income Tax Expense (Benefit), Total | $ (6,300) | $ (4,400) | $ (15,200) |  |

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