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Note 11 - Business Segments and Significant Customers - Information about Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales to unaffiliated customers | $ 645,957 | $ 443,567 | $ 500,781
Income (loss) from operations | 116,944 | (35,611) | 21,628
Capital additions (including non-cash additions) | 181,799 | 160,716 | 151,085
Depreciation, depletion and amortization | 115,468 | 111,489 | 111,134
Other significant non-cash items | 15,850 | 71,204 | 4,232
Identifiable assets | 2,371,677 | 2,221,925 | 2,262,064
Greens Creek [Member] |  |  |
Net sales to unaffiliated customers | 260,446 | 227,833 | 245,175
Income (loss) from operations | 65,125 | 26,536 | 39,758
Capital additions (including non-cash additions) | 42,013 | 45,962 | 31,476
Depreciation, depletion and amortization | 52,564 | 56,553 | 63,505
Other significant non-cash items | 2,736 | 2,886 | 2,807
Identifiable assets | 681,303 | 698,265 | 704,121
Lucky Friday [Member] |  |  |
Net sales to unaffiliated customers | 94,479 | 66,302 | 89,757
Income (loss) from operations | 18,175 | 868 | 21,501
Capital additions (including non-cash additions) | 44,839 | 60,020 | 52,193
Depreciation, depletion and amortization | 11,810 | 11,262 | 9,431
Other significant non-cash items | 720 | 72 | 72
Identifiable assets | 442,829 | 393,338 | 356,482
Casa Berardi [Member] |  |  |
Net sales to unaffiliated customers | 177,143 | 149,432 | 165,849
Income (loss) from operations | 16,336 | (1,557) | 11,828
Capital additions (including non-cash additions) | 67,577 | 35,302 | 48,615
Depreciation, depletion and amortization | 47,312 | 43,674 | 38,198
Other significant non-cash items | 1,259 | 2,229 | 847
Identifiable assets | 806,044 | 779,423 | 800,961
San Sebastian [Member] |  |  |
Net sales to unaffiliated customers | 113,889 |  |
Income (loss) from operations | 77,221 | (9,269) | (5,780)
Capital additions (including non-cash additions) | 6,026 | 4,623 |
Depreciation, depletion and amortization | 3,782 |  |
Other significant non-cash items |  | 13 |
Identifiable assets | 33,608 | 22,238 | 1,529
Other Segments [Member] |  |  |
Income (loss) from operations | (59,913) | (52,189) | (45,679)
Capital additions (including non-cash additions) | 21,344 | 14,809 | 18,801
Other significant non-cash items | 11,135 | 66,004 | 506
Identifiable assets | $ 407,893 | $ 328,661 | $ 398,971

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