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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Sales of products | $ 577,775 | $ 645,957 | $ 443,567
Income (loss) from operations | 64,643 | 116,944 | (35,611)
Capital additions (including non-cash additions) | 105,752 | 181,799 | 160,716
Depreciation, depletion and amortization | 116,062 | 116,126 | 112,678
Other significant non-cash items | 56,999 | 15,850 | 71,204
Identifiable assets | 2,364,957 | 2,371,677 | 2,221,925
Greens Creek [Member] |  |  |
Sales of products | 278,297 | 260,446 | 227,833
Income (loss) from operations | 70,132 | 65,125 | 26,536
Capital additions (including non-cash additions) | 35,255 | 42,013 | 45,962
Depreciation, depletion and amortization | 56,328 | 53,222 | 57,742
Other significant non-cash items | 2,685 | 2,736 | 2,886
Identifiable assets | 671,960 | 681,303 | 698,265
Lucky Friday [Member] |  |  |
Sales of products | 21,555 | 94,479 | 66,302
Income (loss) from operations | (16,037) | 18,175 | 868
Capital additions (including non-cash additions) | 6,268 | 44,839 | 60,020
Depreciation, depletion and amortization | 2,447 | 11,810 | 11,262
Other significant non-cash items | 2,011 | 720 | 72
Identifiable assets | 432,400 | 442,829 | 393,338
Casa Berardi [Member] |  |  |
Sales of products | 192,165 | 177,143 | 149,432
Income (loss) from operations | 4,003 | 16,336 | (1,557)
Capital additions (including non-cash additions) | 51,327 | 67,577 | 35,302
Depreciation, depletion and amortization | 54,594 | 47,312 | 43,674
Other significant non-cash items | 653 | 1,259 | 2,229
Identifiable assets | 804,505 | 806,044 | 779,423
San Sebastian [Member] |  |  |
Sales of products | 85,758 | 113,889 |
Income (loss) from operations | 53,591 | 77,221 | (9,269)
Capital additions (including non-cash additions) | 9,994 | 6,026 | 4,623
Depreciation, depletion and amortization | 2,693 | 3,782 |
Other significant non-cash items | 468 |  | 13
Identifiable assets | 62,198 | 33,608 | 22,238
Other Segments [Member] |  |  |
Income (loss) from operations | (47,046) | (59,913) | (52,189)
Capital additions (including non-cash additions) | 2,908 | 21,344 | 14,809
Other significant non-cash items | 51,182 | 11,135 | 66,004
Identifiable assets | $ 393,894 | $ 407,893 | $ 328,661

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