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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 20, 2018
Deferred Tax Liabilities, Net, Total | $ 162,900 |  |  |  |  | $ 162,900 |  |  |  |
Income Tax Expense (Benefit), Total | (2,679) | $ (5,130) | $ 16,366 | $ (28,800) | $ (12,434) | (1,484) | $ (17,564) | $ 20,963 | $ 28,090 |
Net Income (Loss) Attributable to Parent, Total | (23,184) | $ 314 | $ (24,948) | 25,082 | $ 134 | (2,870) | $ 447 | $ (28,520) | $ 61,569 |
Klondex Mines Ltd [Member] |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net, Total |  |  |  |  |  |  |  |  |  | $ 50,100
Income Tax Expense (Benefit), Total | (3,800) |  |  |  |  | (3,800) |  |  |  |
Net Income (Loss) Attributable to Parent, Total | (15,200) |  |  |  |  | (15,200) |  |  |  |
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net, Total | 46,700 |  |  |  |  | 46,700 |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  | $ (15,000) |  |  |  |  |  |
Canada Revenue Agency [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net, Total | 118,100 |  |  |  |  | 118,100 |  |  |  |
Mexican Tax Authority [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | $ 1,900 |  |  |  |  | $ 1,900 |  |  |  |

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