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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 11 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 13, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Tax Liabilities, Net, Total |  | $ 171,550 | $ 122,843 |  |
Liability Related to Withholding Taxes on Foreign Earnings Repatriated |  |  | 300 |  |
Foreign Earnings Repatriated |  |  |  | $ 0 |
Income Tax Expense (Benefit), Total |  | (6,701) | 20,963 | 28,090 |
Net Income (Loss) Attributable to Parent, Total |  | (26,563) | (28,520) | 61,569 |
Deferred Tax Assets, Valuation Allowance, Total |  | $ 94,981 | 78,684 | $ 99,602 | $ 115,806
Operating Loss Carryforwards Expiration Period |  | 20 years |  |  |
Deferred Tax Assets, Net Operating Loss |  | $ 5,000 |  |  |
Unrecognized Tax Benefits, Ending Balance |  | 0 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 30,000 |  |
Domestic Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 92,000 |  |  |
Operating Loss Carryforwards, Total |  | 605,900 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  | 50,000 |  |  |
Foreign Tax Authority [Member] | Hecla Canada Limited [Member] | Canada Revenue Agency [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 1,300 |  |  |
Foreign Tax Authority [Member] | Minera Hecla S.A. [Member] | Mexican Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 1,700 |  |  |
Foreign Tax Authority [Member] | Hecla Quebec. Inc [Member] | Canada Revenue Agency [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 0 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  | 383,300 |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |
Deferred Tax Liabilities, Net, Total |  | 69,400 |  |  |
Income Tax Expense (Benefit), Total | $ 6,300 |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  | $ (30,000) |  |  |
Reclassification From Current Deferred Tax Assets to Non-Current Deferred Tax Assets [Member] | As of December 31, 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | 12,300 |  |
Reclassification From Current Deferred Tax Liabilities to Non-Current Deferred Tax Liabilities [Member] | As of December 31, 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 1,300 |  |

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