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Note 8 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | $ 79,557 | $ 68,684
Lucky Friday Pension Plan [Member] |  |
Total fair value | 20,365 | 18,673
Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 51,300 | 45,223
Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 12,626 | 12,307
Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 14,802 | 12,379
Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 4,115 | 3,427
Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 13,455 | 11,082
Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 3,624 | 2,939
Interest-bearing Deposits [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 351 | 1,924
Interest-bearing Deposits [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 100 | 550
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 351 | 1,924
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 100 | 550
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 | 3,768 | 4,973
Common Stock [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 1,015 | 1,340
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 3,768 | 4,973
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 1,015 | 1,340
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 |  |
Real Estate Investments [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 11,154 | 8,974
Real Estate Investments [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 3,023 | 2,389
Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value |  |
Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value |  |
Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value |  |
Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value |  |
Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 11,154 | 8,974
Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 3,023 | 2,389
Common Collective Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 17,103 | 14,487
Common Collective Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 4,716 | 3,977
Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value |  |
Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value |  |
Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 14,802 | 12,379
Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 4,115 | 3,427
Common Collective Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 2,301 | 2,108
Common Collective Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 601 | 550
Mutual Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 47,181 | 38,326
Mutual Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 11,511 | 10,417
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | 47,181 | 38,326
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Lucky Friday Pension Plan [Member] |  |
Total fair value | 11,511 | 10,417
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 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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