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Note 8 - Employee Benefit Plans - Employee Allocations of Investments and Measurement Dates by Asset Category (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 100.00% | 100.00%
Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 100.00% | 100.00%
Cash [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 3.00% | 2.00%
Cash [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 3.00% | 4.00%
Large Cap US Equity [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 18.00% | 10.00%
Large Cap US Equity [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 17.00% | 10.00%
Small Cap US Equity [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 9.00% | 5.00%
Small Cap US Equity [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 9.00% | 5.00%
Foreign Government Debt Securities [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 24.00% | 9.00%
Foreign Government Debt Securities [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 25.00% | 9.00%
Fixed Income Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 20.00% | 34.00%
Fixed Income Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 20.00% | 33.00%
Real Estate [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 13.00% | 18.00%
Real Estate [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 13.00% | 18.00%
Hedge Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 6.00% | 15.00%
Hedge Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 6.00% | 14.00%
Real Return [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments |  | 1.00%
Real Return [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments |  | 1.00%
Common Stock [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Allocation of investments | 7.00% | 6.00%
Common Stock [Member] | Lucky Friday Pension Plan [Member] |  |
Allocation of investments | 7.00% | 6.00%

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