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Note 3 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 20, 2018
Deferred Tax Liabilities, Net, Total | $ 139,700 |  | $ 139,700 |  |
Income Tax Expense (Benefit), Total | (1,614) | $ (2,679) | (20,009) | $ (1,484) |
Klondex Mines Ltd [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total |  |  |  |  | $ 59,500
Income Tax Expense (Benefit), Total | 2,400 |  | 10,300 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total | 43,100 |  | 43,100 |  |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total | 100,300 |  | 100,300 |  |
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total | $ 3,700 |  | $ 3,700 |  |

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