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Note 8 - Employee Benefit Plans - Fair Value by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Hecla Mining Company Retirement Plan [Member] |  |
Total fair value | $ 68,684 | $ 57,673
Hecla Mining Company Retirement Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 45,223 | 33,023
Hecla Mining Company Retirement Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value | 12,379 | 9,862
Hecla Mining Company Retirement Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 11,082 | 14,788
Hecla Mining Company Retirement Plan [Member] | Interest-bearing Deposits [Member] |  |
Total fair value | 1,924 | 936
Hecla Mining Company Retirement Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 1,924 | 936
Hecla Mining Company Retirement Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Common Stock [Member] |  |
Total fair value | 4,973 | 3,284
Hecla Mining Company Retirement Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 4,973 | 3,284
Hecla Mining Company Retirement Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Real Estate Investments [Member] |  |
Total fair value | 8,974 | 10,326
Hecla Mining Company Retirement Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 8,974 | 10,326
Hecla Mining Company Retirement Plan [Member] | Common Collective Funds [Member] |  |
Total fair value | 14,487 | 14,324
Hecla Mining Company Retirement Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value | 12,379 | 9,862
Hecla Mining Company Retirement Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 2,108 | 4,462
Hecla Mining Company Retirement Plan [Member] | Mutual Funds [Member] |  |
Total fair value | 38,326 | 28,803
Hecla Mining Company Retirement Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 38,326 | 28,803
Hecla Mining Company Retirement Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Hecla Mining Company Retirement Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] |  |
Total fair value | 18,673 | 15,648
Lucky Friday Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 12,307 | 8,910
Lucky Friday Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value | 3,427 | 2,573
Lucky Friday Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 2,939 | 4,165
Lucky Friday Pension Plan [Member] | Interest-bearing Deposits [Member] |  |
Total fair value | 550 | 76
Lucky Friday Pension Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 550 | 76
Lucky Friday Pension Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Common Stock [Member] |  |
Total fair value | 1,340 | 989
Lucky Friday Pension Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 1,340 | 989
Lucky Friday Pension Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Real Estate Investments [Member] |  |
Total fair value | 2,389 | 2,856
Lucky Friday Pension Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Real Estate Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 2,389 | 2,856
Lucky Friday Pension Plan [Member] | Common Collective Funds [Member] |  |
Total fair value | 3,977 | 3,882
Lucky Friday Pension Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value | 3,427 | 2,573
Lucky Friday Pension Plan [Member] | Common Collective Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total fair value | 550 | 1,309
Lucky Friday Pension Plan [Member] | Mutual Funds [Member] |  |
Total fair value | 10,417 | 7,845
Lucky Friday Pension Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total fair value | 10,417 | 7,845
Lucky Friday Pension Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total fair value |  |
Lucky Friday Pension Plan [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 3 [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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