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Note 12 - Business Segments, Sales of Products and Significant Customers (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 265,650 |  |  | $ | 278,297 |  |  | $ | 260,446 |
Lucky Friday |  |  | 9,750 |  |  |  | 21,555 |  |  |  | 94,479 |
Casa Berardi |  |  | 210,339 |  |  |  | 192,165 |  |  |  | 177,143 |
San Sebastian |  |  | 50,224 |  |  |  | 85,758 |  |  |  | 113,889 |
Nevada Operations |  |  | 31,174 |  |  |  | — |  |  |  | — |
Total sales to unaffiliated customers |  | $ | 567,137 |  |  | $ | 577,775 |  |  | $ | 645,957 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 70,293 |  |  | $ | 70,132 |  |  | $ | 65,125 |
Lucky Friday |  |  | (20,199 | ) |  |  | (16,037 | ) |  |  | 18,175 |
Casa Berardi (1) |  |  | 881 |  |  |  | (534 | ) |  |  | 8,831 |
San Sebastian |  |  | (14 | ) |  |  | 53,591 |  |  |  | 77,221 |
Nevada Operations |  |  | (26,715 | ) |  |  | — |  |  |  | — |
Other |  |  | (63,372 | ) |  |  | (47,046 | ) |  |  | (59,913 | )
Total (loss) income from operations (1) |  | $ | (39,126 | ) |  | $ | 60,106 |  |  | $ | 109,439 |
Capital additions (including non-cash additions): |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 43,631 |  |  | $ | 35,255 |  |  | $ | 42,013 |
Lucky Friday |  |  | 14,236 |  |  |  | 6,268 |  |  |  | 44,839 |
Casa Berardi |  |  | 39,816 |  |  |  | 51,327 |  |  |  | 67,577 |
San Sebastian |  |  | 8,492 |  |  |  | 9,994 |  |  |  | 6,026 |
Nevada Operations |  |  | 35,721 |  |  |  | — |  |  |  | — |
Other |  |  | 4,555 |  |  |  | 2,908 |  |  |  | 21,344 |
Total capital additions |  | $ | 146,451 |  |  | $ | 105,752 |  |  | $ | 181,799 |
Depreciation, depletion and amortization: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 46,511 |  |  | $ | 56,328 |  |  | $ | 53,222 |
Lucky Friday |  |  | 1,012 |  |  |  | 2,447 |  |  |  | 11,810 |
Casa Berardi (1) |  |  | 71,302 |  |  |  | 59,131 |  |  |  | 54,817 |
San Sebastian |  |  | 4,602 |  |  |  | 2,693 |  |  |  | 3,782 |
Nevada Operations |  |  | 10,617 |  |  |  | — |  |  |  | — |
Total depreciation, depletion and amortization (1) |  | $ | 134,044 |  |  | $ | 120,599 |  |  | $ | 123,631 |
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 3,325 |  |  | $ | 2,685 |  |  | $ | 2,736 |
Lucky Friday |  |  | 618 |  |  |  | 2,011 |  |  |  | 720 |
Casa Berardi (1) |  |  | 696 |  |  |  | 33 |  |  |  | 1,072 |
San Sebastian |  |  | 419 |  |  |  | 468 |  |  |  | — |
Nevada Operations |  |  | 8,758 |  |  |  | — |  |  |  | — |
Other |  |  | (23,358 | ) |  |  | 52,266 |  |  |  | 11,795 |
Total other significant non-cash items (1) |  | $ | (9,542 | ) |  | $ | 57,463 |  |  | $ | 16,323 |
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 637,386 |  |  | $ | 671,960 |  |  | $ | 681,303 |
Lucky Friday |  |  | 437,499 |  |  |  | 432,400 |  |  |  | 442,829 |
Casa Berardi (1) |  |  | 754,248 |  |  |  | 784,706 |  |  |  | 790,162 |
San Sebastian |  |  | 44,152 |  |  |  | 62,198 |  |  |  | 33,608 |
Nevada Operations |  |  | 581,194 |  |  |  | — |  |  |  | — |
Other |  |  | 249,465 |  |  |  | 393,894 |  |  |  | 407,893 |
Total identifiable assets (1) |  | $ | 2,703,944 |  |  | $ | 2,345,158 |  |  | $ | 2,355,795 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | 2018 |  |  | 2017 |
United States |  | $ | 1,797,441 |  |  | $ | 1,248,824 |
Canada (1) |  |  | 707,473 |  |  |  | 743,779 |
Mexico |  |  | 15,090 |  |  |  | 6,708 |
Total long-lived assets (1) |  | $ | 2,520,004 |  |  | $ | 1,999,311 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Greens Creek |  |  | 46.7 | % |  |  | 48.1 | % |  |  | 40.3 | %
Lucky Friday |  |  | 1.8 | % |  |  | 3.8 | % |  |  | 14.7 | %
Casa Berardi |  |  | 37.1 | % |  |  | 33.3 | % |  |  | 27.4 | %
San Sebastian |  |  | 8.9 | % |  |  | 14.8 | % |  |  | 17.6 | %
Nevada Operations |  |  | 5.5 | % |  |  | — | % |  |  | — | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Silver |  | $ | 144,609 |  |  | $ | 194,813 |  |  | $ | 274,438 |
Gold |  |  | 313,076 |  |  |  | 277,421 |  |  |  | 276,630 |
Lead |  |  | 33,829 |  |  |  | 37,995 |  |  |  | 63,942 |
Zinc |  |  | 99,800 |  |  |  | 104,023 |  |  |  | 95,058 |
Less: Smelter and refining charges |  |  | (24,177 | ) |  |  | (36,477 | ) |  |  | (64,111 | )
Sales of products |  | $ | 567,137 |  |  | $ | 577,775 |  |  | $ | 645,957 |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Doré and metals from doré |  | $ | 311,567 |  |  | $ | 295,176 |  |  | $ | 313,784 |
Lead concentrate |  |  | 148,880 |  |  |  | 179,143 |  |  |  | 250,153 |
Zinc concentrate |  |  | 80,938 |  |  |  | 88,688 |  |  |  | 82,872 |
Bulk concentrate |  |  | 17,668 |  |  |  | 20,751 |  |  |  | 13,384 |
Total, excluding gains/losses on forward contracts |  | $ | 559,053 |  |  | $ | 583,758 |  |  | $ | 660,193 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
United States |  | $ | 48,437 |  |  | $ | 16,806 |  |  | $ | 22,499 |
Canada |  |  | 322,402 |  |  |  | 358,663 |  |  |  | 437,621 |
Japan |  |  | 42,885 |  |  |  | 58,475 |  |  |  | 44,158 |
Korea |  |  | 145,263 |  |  |  | 80,183 |  |  |  | 116,687 |
China |  |  | 66 |  |  |  | 69,631 |  |  |  | 35,220 |
Other |  |  | — |  |  |  | — |  |  |  | 4,008 |
Total, excluding gains/losses on forward contracts |  | $ | 559,053 |  |  | $ | 583,758 |  |  | $ | 660,193 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Teck Metals Ltd. |  |  | 8.4 | % |  |  | 11.3 | % |  |  | 21.2 | %
Korea Zinc |  |  | 17.8 | % |  |  | 16.4 | % |  |  | 16.9 | %
Scotia |  |  | 15.3 | % |  |  | 24.9 | % |  |  | 24.5 | %
CIBC |  |  | 29.7 | % |  |  | 22.8 | % |  |  | 19.0 | %

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