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Note 11 - Business Segments and Significant Customers (Details) - Information about Reportable Segments - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net sales to unaffiliated customers: |  |  |
Net sales to unaffiliated customers | $ 443,567 | $ 500,781 | $ 382,589
Income (loss) from operations: |  |  |
Income (loss) from operations | (35,611) | 21,628 | (32,394)
Capital additions (including non-cash additions): |  |  |
Capital additions | 160,716 | 151,085 | 162,608
Depreciation, depletion and amortization: |  |  |
Depreciation, depletion and amortization | 112,585 | 112,173 | 82,366
Other significant non-cash items: |  |  |
Other significant non-cash items | 71,204 | 4,232 | 4,043
Identifiable assets: |  |  |
Identifiable assets | 2,221,925 | 2,262,064 | 2,232,119
Greens Creek [Member] |  |  |
Net sales to unaffiliated customers: |  |  |
Net sales to unaffiliated customers | 227,833 | 245,175 | 263,263
Income (loss) from operations: |  |  |
Income (loss) from operations | 26,536 | 39,758 | 62,178
Capital additions (including non-cash additions): |  |  |
Capital additions | 45,962 | 31,476 | 57,119
Depreciation, depletion and amortization: |  |  |
Depreciation, depletion and amortization | 56,553 | 63,505 | 55,265
Other significant non-cash items: |  |  |
Other significant non-cash items | 2,886 | 2,807 | 1,961
Identifiable assets: |  |  |
Identifiable assets | 698,265 | 704,121 | 744,027
Lucky Friday [Member] |  |  |
Net sales to unaffiliated customers: |  |  |
Net sales to unaffiliated customers | 66,302 | 89,757 | 44,204
Income (loss) from operations: |  |  |
Income (loss) from operations | 868 | 21,501 | (3,563)
Capital additions (including non-cash additions): |  |  |
Capital additions | 60,020 | 52,193 | 55,902
Depreciation, depletion and amortization: |  |  |
Depreciation, depletion and amortization | 11,262 | 9,431 | 7,833
Other significant non-cash items: |  |  |
Other significant non-cash items | 72 | 72 | 96
Identifiable assets: |  |  |
Identifiable assets | 393,338 | 356,482 | 313,793
Casa Berardi [Member] |  |  |
Net sales to unaffiliated customers: |  |  |
Net sales to unaffiliated customers | 149,432 | 165,849 | 75,122
Income (loss) from operations: |  |  |
Income (loss) from operations | (1,557) | 11,828 | (15,708)
Capital additions (including non-cash additions): |  |  |
Capital additions | 35,302 | 48,615 | 41,425
Depreciation, depletion and amortization: |  |  |
Depreciation, depletion and amortization | 43,674 | 38,198 | 18,030
Other significant non-cash items: |  |  |
Other significant non-cash items | 2,229 | 847 | 474
Identifiable assets: |  |  |
Identifiable assets | 779,423 | 800,961 | 821,058
San Sebastian Unit [Member] |  |  |
Income (loss) from operations: |  |  |
Income (loss) from operations | (9,269) | (5,780) | (6,445)
Capital additions (including non-cash additions): |  |  |
Capital additions | 4,623 |  |
Other significant non-cash items: |  |  |
Other significant non-cash items | 13 |  |
Identifiable assets: |  |  |
Identifiable assets | 22,238 | 1,529 | 1,491
Other Segments [Member] |  |  |
Income (loss) from operations: |  |  |
Income (loss) from operations | (52,189) | (45,679) | (68,856)
Capital additions (including non-cash additions): |  |  |
Capital additions | 14,809 | 18,801 | 8,162
Other significant non-cash items: |  |  |
Other significant non-cash items | 66,004 | 506 | 1,512
Identifiable assets: |  |  |
Identifiable assets | 328,661 | 398,971 | 351,750
Segment Depreciation Depletion and Amortization [Member] |  |  |
Depreciation, depletion and amortization: |  |  |
Depreciation, depletion and amortization | $ 111,489 | $ 111,134 | $ 81,128

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