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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred Tax Assets, Valuation Allowance | $ 99,602 | $ 115,806 | $ 32,094 | $ 27,155
Deferred Tax Liabilities, Net | $ 87,012 | 65,729 |  |
Operating Loss Carryforwards Expiration Period | 20 years |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 20,405 | 11,607 |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 22,000 | 20,000 |  |
Foreign Earnings Repatriated | 0 | 0 | $ 0 |
Unrecognized Tax Benefits | 0 | $ 0 |  |
Domestic Tax Authority [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 96,000 |  |  |
Operating Loss Carryforwards | 244,000 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards | 4,000 |  |  |
Foreign Tax Authority [Member] | Hecla Canada Limited [Member] | Canada Revenue Agency [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 2,000 |  |  |
Foreign Tax Authority [Member] | Minera Hecla S.A. [Member] | Mexican Tax Authority [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 1,000 |  |  |
Foreign Tax Authority [Member] | Hecla Quebec. Inc [Member] | Canada Revenue Agency [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 0 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards | $ 84,000 |  |  |

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