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Note 5 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 21, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Tax Assets, Valuation Allowance |  | $ 78,684,000 |  | $ 99,602,000 | $ 115,806,000 | $ 32,094,000
Deferred Tax Liabilities, Net |  | 120,037,000 |  | 87,012,000 |  |
Liability Related to Withholding Taxes on Foreign Earnings Repatriated |  | $ 300,000 |  |  |  |
Foreign Earnings Repatriated |  |  |  | 0 |  |
Operating Loss Carryforwards Expiration Period |  | 20 years |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation |  | $ 0 |  | 22,000,000 |  |
Deferred Tax Assets, Net Operating Loss |  | 5,000,000 |  |  |  |
Unrecognized Tax Benefits |  | $ 0 |  | $ 0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% | 35.00% | 35.00% | 35.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ 30,000,000 |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 76,000,000 |  |  |  |
Operating Loss Carryforwards |  | 506,000,000 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |
Operating Loss Carryforwards |  | 4,000,000 |  |  |  |
Foreign Tax Authority [Member] | Hecla Canada Limited [Member] | Canada Revenue Agency [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 2,000,000 |  |  |  |
Foreign Tax Authority [Member] | Minera Hecla S.A. [Member] | Mexican Tax Authority [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 1,000,000 |  |  |  |
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 |  | 366,000,000 |  |  |  |
Reclassification From Current Deferred Tax Assets to Non-Current Deferred Tax Assets [Member] | As of December 31, 2016 [Member] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 12,300,000 |  |  |  |
Reclassification From Current Deferred Tax Liabilities to Non-Current Deferred Tax Liabilities [Member] | As of December 31, 2016 [Member] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 1,300,000 |  |  |  |

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