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Note 12 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales |  | $ 567,137 | $ 577,775 | $ 645,957
Income (loss) from operations | [1] | (39,126) | 60,106 | 109,439
Capital additions (including non-cash additions) |  | 146,451 | 105,752 | 181,799
Depreciation, depletion and amortization | [1] | 134,044 | 120,599 | 123,631
Other significant non-cash items | [1] | (9,542) | 57,463 | 16,323
Identifiable assets | [1] | 2,703,944 | 2,345,158 | 2,355,795
Greens Creek [Member] |  |  |  |
Net sales |  | 265,650 | 278,297 | 260,446
Income (loss) from operations |  | 70,293 | 70,132 | 65,125
Capital additions (including non-cash additions) |  | 43,631 | 35,255 | 42,013
Depreciation, depletion and amortization |  | 46,511 | 56,328 | 53,222
Other significant non-cash items |  | 3,325 | 2,685 | 2,736
Identifiable assets |  | 637,386 | 671,960 | 681,303
Lucky Friday [Member] |  |  |  |
Net sales |  | 9,750 | 21,555 | 94,479
Income (loss) from operations |  | (20,199) | (16,037) | 18,175
Capital additions (including non-cash additions) |  | 14,236 | 6,268 | 44,839
Depreciation, depletion and amortization |  | 1,012 | 2,447 | 11,810
Other significant non-cash items |  | 618 | 2,011 | 720
Identifiable assets |  | 437,499 | 432,400 | 442,829
Casa Berardi [Member] |  |  |  |
Net sales |  | 210,339 | 192,165 | 177,143
Income (loss) from operations | [1] | 881 | (534) | 8,831
Capital additions (including non-cash additions) |  | 39,816 | 51,327 | 67,577
Depreciation, depletion and amortization | [1] | 71,302 | 59,131 | 54,817
Other significant non-cash items | [1] | 696 | 33 | 1,072
Identifiable assets | [1] | 754,248 | 784,706 | 790,162
San Sebastian [Member] |  |  |  |
Net sales |  | 50,224 | 85,758 | 113,889
Income (loss) from operations |  | (14) | 53,591 | 77,221
Capital additions (including non-cash additions) |  | 8,492 | 9,994 | 6,026
Depreciation, depletion and amortization |  | 4,602 | 2,693 | 3,782
Other significant non-cash items |  | 419 | 468 |
Identifiable assets |  | 44,152 | 62,198 | 33,608
Nevada Operations [Member] |  |  |  |
Net sales |  | 31,174 |  |
Income (loss) from operations |  | (26,715) |  |
Capital additions (including non-cash additions) |  | 35,721 |  |
Depreciation, depletion and amortization |  | 10,617 |  |
Other significant non-cash items |  | 8,758 |  |
Identifiable assets |  | 581,194 |  |
Other Segments [Member] |  |  |  |
Income (loss) from operations |  | (63,372) | (47,046) | (59,913)
Capital additions (including non-cash additions) |  | 4,555 | 2,908 | 21,344
Other significant non-cash items |  | (23,358) | 52,266 | 11,795
Identifiable assets |  | $ 249,465 | $ 393,894 | $ 407,893
[1] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.

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