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Note 9 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Total fair value | $ 96,329 | $ 99,922 | $ 87,357
Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 77,653 | 79,557 |
Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 18,676 | 20,365 |
Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 52,223 | 51,300 |
Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 11,970 | 12,626 |
Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 52,223 | 51,300 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 11,970 | 12,626 |
Fair Value Measured at Net Asset Value Per Share [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 25,430 | 28,257 |
Fair Value Measured at Net Asset Value Per Share [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 6,706 | 7,739 |
Interest-bearing Deposits [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 389 | 351 |
Interest-bearing Deposits [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 111 | 100 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 389 | 351 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 111 | 100 |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Common Stock [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 7,874 | 3,768 |
Common Stock [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 1,428 | 1,015 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 7,874 | 3,768 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 1,428 | 1,015 |
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Mutual Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 43,960 | 47,181 |
Mutual Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 10,431 | 11,511 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 43,960 | 47,181 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 10,431 | 11,511 |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  |  |
Real Estate Investments [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 11,926 | 11,154 |
Real Estate Investments [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 3,231 | 3,023 |
Hedge Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 4,283 | 4,247 |
Hedge Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 1,149 | 1,140 |
Common Collective Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 9,221 | 12,856 |
Common Collective Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | $ 2,326 | $ 3,576 |

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