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Note 6 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Total fair value | $ 184,334 | $ 176,958 | $ 175,159
Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 109,396 | 103,962 |
Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 16,071 | 15,781 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 109,396 | 103,962 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 16,071 | 15,781 |
Fair Value Measured at Net Asset Value Per Share [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 157,402 | 150,377 |
Fair Value Measured at Net Asset Value Per Share [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 26,932 | 26,581 |
Interest-Bearing Deposits [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 2,699 | 525 |
Interest-Bearing Deposits [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 123 | 117 |
Interest-Bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 2,699 | 525 |
Interest-Bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 123 | 117 |
Common Stock [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 18,874 | 19,933 |
Common Stock [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 2,932 | 2,872 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 18,874 | 19,933 |
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 2,932 | 2,872 |
Mutual Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 87,823 | 83,504 |
Mutual Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 13,016 | 12,792 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 87,823 | 83,504 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 13,016 | 12,792 |
Real Estate Investments [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 16,318 | 18,029 |
Real Estate Investments [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 3,698 | 4,173 |
Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  | 0 |
Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  | 0 |
Common Collective Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 31,688 | 28,386 |
Common Collective Funds [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | 7,163 | 6,627 |
Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  | 0 |
Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  | 0 |
Investments Measured At Net Asset Value [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value | 48,006 | 46,415 |
Investments Measured At Net Asset Value [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value | $ 10,861 | 10,800 |
Investments Measured At Net Asset Value [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |  |
Total fair value |  | 0 |
Investments Measured At Net Asset Value [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |  |
Total fair value |  | $ 0 |

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