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Note 12 - Business Segments, Sales of Products and Significant Customers - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net sales | $ 691,873 | $ 673,266 | $ 567,137
Income (loss) from operations | 51,581 | (57,109) | (39,126)
Capital additions (including non-cash additions) | 102,519 | 123,729 | 146,451
Depreciation, depletion and amortization | 157,130 | 199,518 | 134,044
Other significant non-cash items | 11,164 | 5,875 | (9,542)
Identifiable assets | 2,667,724 | 2,637,308 | 2,703,944
Greens Creek [Member] |  |  |
Net sales | 327,820 | 299,722 | 265,650
Income (loss) from operations | 108,230 | 84,868 | 70,293
Capital additions (including non-cash additions) | 23,665 | 35,829 | 43,631
Depreciation, depletion and amortization | 49,692 | 47,587 | 46,511
Other significant non-cash items | 3,103 | 2,868 | 3,325
Identifiable assets | 610,360 | 639,047 | 637,386
Lucky Friday [Member] |  |  |
Net sales | 63,025 | 16,621 | 9,750
Income (loss) from operations | (1,711) | (12,520) | (20,199)
Capital additions (including non-cash additions) | 27,284 | 7,861 | 14,236
Depreciation, depletion and amortization | 11,473 | 1,175 | 1,012
Other significant non-cash items | 881 | 996 | 618
Identifiable assets | 520,463 | 440,615 | 437,499
Casa Berardi [Member] |  |  |
Net sales | 209,224 | 192,944 | 210,339
Income (loss) from operations | 1,359 | (33,499) | 881
Capital additions (including non-cash additions) | 47,576 | 33,906 | 39,816
Depreciation, depletion and amortization | 69,572 | 73,960 | 71,302
Other significant non-cash items | (1,741) | 5,203 | 696
Identifiable assets | 694,522 | 703,511 | 754,248
San Sebastian [Member] |  |  |
Net sales | 32,906 | 56,210 | 50,224
Income (loss) from operations | 2,793 | 569 | (14)
Capital additions (including non-cash additions) |  | 3,906 | 8,492
San Sebastian | (47) |  |
Depreciation, depletion and amortization | 3,548 | 9,772 | 4,602
Other significant non-cash items | 456 | 492 | 419
Identifiable assets | 42,617 | 48,294 | 44,152
Nevada Operations [Member] |  |  |
Net sales | 58,898 | 107,769 | 31,174
Income (loss) from operations | (6,674) | (49,224) | (26,715)
Capital additions (including non-cash additions) | 4,003 | 42,154 | 35,721
Depreciation, depletion and amortization | 22,845 | 67,024 | 10,617
Other significant non-cash items | 2,039 | 2,911 | 8,758
Identifiable assets | 513,309 | 528,466 | 581,194
Other Segments [Member] |  |  |
Income (loss) from operations | (52,416) | (47,303) | (63,372)
Capital additions (including non-cash additions) | 38 | 73 | 4,555
Other significant non-cash items | 6,426 | (6,595) | (23,358)
Identifiable assets | $ 286,453 | $ 277,375 | $ 249,465

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