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Note 8 - Employee Benefit Plans - Reconciliation of Level 3 Assets (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Real Estate [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Beginning balance | $ 10,326 | $ 8,889
Net unrealized gains on assets held at the reporting date | 283 | 1,094
Purchases | 333 | 343
Sales | (1,968) |
Ending balance | 8,974 | 10,326
Real Estate [Member] | Lucky Friday Pension Plan [Member] |  |
Beginning balance | 2,856 | 2,458
Net unrealized gains on assets held at the reporting date | 71 | 303
Purchases | 90 | 95
Sales | (628) |
Ending balance | 2,389 | 2,856
Common Collective Funds [Member] | Hecla Mining Company Retirement Plan [Member] |  |
Beginning balance | 4,462 | 8,454
Net unrealized gains on assets held at the reporting date | 80 | 8
Purchases |  |
Sales | (2,434) | (4,000)
Ending balance | 2,108 | 4,462
Common Collective Funds [Member] | Lucky Friday Pension Plan [Member] |  |
Beginning balance | 1,309 | 2,306
Net unrealized gains on assets held at the reporting date | 20 | 3
Purchases |  |
Sales | (779) | (1,000)
Ending balance | $ 550 | $ 1,309

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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