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Note 4 - Business Segments, Sales of Products and Significant Customers (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 384,843 |  |  | $ | 327,820 |  |  | $ | 299,722 |
Lucky Friday |  |  | 131,488 |  |  |  | 63,025 |  |  |  | 16,621 |
Casa Berardi |  |  | 245,152 |  |  |  | 209,224 |  |  |  | 192,944 |
Nevada Operations |  |  | 45,814 |  |  |  | 58,898 |  |  |  | 107,769 |
Other |  |  | 176 |  |  |  | 32,906 |  |  |  | 56,210 |
Total sales to unaffiliated customers |  | $ | 807,473 |  |  | $ | 691,873 |  |  | $ | 673,266 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek (1) |  | $ | 164,666 |  |  | $ | 114,607 |  |  | $ | 87,232 |
Lucky Friday |  |  | 31,683 |  |  |  | (1,711 | ) |  |  | (12,520 | )
Casa Berardi (1) |  |  | 5,807 |  |  |  | 10,379 |  |  |  | (25,432 | )
Nevada Operations |  |  | (46,115 | ) |  |  | (6,674 | ) |  |  | (49,224 | )
Other |  |  | (72,621 | ) |  |  | (49,623 | ) |  |  | (46,734 | )
Total income (loss) from operations (1) |  | $ | 83,420 |  |  | $ | 66,978 |  |  | $ | (46,678 | )
Capital additions (excluding non-cash items): |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 23,883 |  |  | $ | 19,685 |  |  | $ | 29,570 |
Lucky Friday |  |  | 29,885 |  |  |  | 25,776 |  |  |  | 8,989 |
Casa Berardi |  |  | 49,617 |  |  |  | 40,840 |  |  |  | 36,059 |
Nevada Operations |  |  | 5,470 |  |  |  | 4,003 |  |  |  | 42,953 |
Other |  |  | 193 |  |  |  | 712 |  |  |  | 3,850 |
Total capital additions |  | $ | 109,048 |  |  | $ | 91,016 |  |  | $ | 121,421 |
Depreciation, depletion and amortization: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 48,710 |  |  |  | 49,692 |  |  | $ | 47,587 |
Lucky Friday |  |  | 26,846 |  |  |  | 11,473 |  |  |  | 1,175 |
Casa Berardi (1) |  |  | 80,744 |  |  |  | 60,552 |  |  |  | 65,893 |
Nevada Operations |  |  | 15,341 |  |  |  | 22,845 |  |  |  | 67,024 |
Other |  |  | 152 |  |  |  | 3,548 |  |  |  | 9,772 |
Total depreciation, depletion and amortization (1) |  | $ | 171,793 |  |  | $ | 148,110 |  |  | $ | 191,451 |
Other significant non-cash items: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 3,653 |  |  | $ | 3,103 |  |  | $ | 2,868 |
Lucky Friday |  |  | 1,048 |  |  |  | 881 |  |  |  | 996 |
Casa Berardi |  |  | 1,284 |  |  |  | (1,741 | ) |  |  | 5,203 |
Nevada Operations |  |  | 7,740 |  |  |  | 2,039 |  |  |  | 2,911 |
Other (1) |  |  | (20,030 | ) |  |  | 8,569 |  |  |  | (2,684 | )
Total other significant non-cash items |  | $ | (6,305 | ) |  | $ | 12,851 |  |  | $ | 9,294 |
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 589,944 |  |  | $ | 610,360 |  |  | $ | 639,047 |
Lucky Friday |  |  | 516,545 |  |  |  | 520,463 |  |  |  | 440,615 |
Casa Berardi (1) |  |  | 701,868 |  |  |  | 727,008 |  |  |  | 726,977 |
Nevada Operations |  |  | 468,985 |  |  |  | 513,309 |  |  |  | 528,466 |
Other |  |  | 451,466 |  |  |  | 329,070 |  |  |  | 325,669 |
Total identifiable assets (1) |  | $ | 2,728,808 |  |  | $ | 2,700,210 |  |  | $ | 2,660,774 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | 2021 |  |  | 2020 |
United States |  | $ | 1,662,689 |  |  | $ | 1,701,307 |
Canada (1) |  |  | 640,367 |  |  |  | 668,643 |
Mexico |  |  | 7,754 |  |  |  | 8,124 |
Total long-lived assets (1) |  | $ | 2,310,810 |  |  | $ | 2,378,074 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Greens Creek |  |  | 47.6 | % |  |  | 47.4 | % |  |  | 44.5 | %
Lucky Friday |  |  | 16.3 | % |  |  | 9.1 | % |  |  | 2.5 | %
Casa Berardi |  |  | 30.4 | % |  |  | 30.2 | % |  |  | 28.7 | %
Nevada Operations |  |  | 5.7 | % |  |  | 8.5 | % |  |  | 16.0 | %
Other |  |  | — | % |  |  | 4.8 | % |  |  | 8.3 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Silver |  | $ | 293,646 |  |  | $ | 260,227 |  |  | $ | 192,235 |
Gold |  |  | 362,037 |  |  |  | 356,166 |  |  |  | 388,602 |
Lead |  |  | 75,431 |  |  |  | 48,776 |  |  |  | 35,777 |
Zinc |  |  | 125,292 |  |  |  | 95,065 |  |  |  | 89,656 |
Less: Smelter and refining charges |  |  | (48,933 | ) |  |  | (68,361 | ) |  |  | (33,004 | )
Sales of products |  | $ | 807,473 |  |  | $ | 691,873 |  |  | $ | 673,266 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
United States |  | $ | 71,278 |  |  | $ | 115,378 |  |  | $ | 53,612 |
Canada |  |  | 419,090 |  |  |  | 321,896 |  |  |  | 379,095 |
Japan |  |  | 63,588 |  |  |  | 39,418 |  |  |  | 48,841 |
Netherlands |  |  | — |  |  |  | (923 | ) |  |  | 38,420 |
Korea |  |  | 203,115 |  |  |  | 166,402 |  |  |  | 154,581 |
China |  |  | 50,945 |  |  |  | 66,082 |  |  |  | — |
Total, excluding gains/losses on forward contracts |  | $ | 808,016 |  |  | $ | 708,253 |  |  | $ | 674,549 |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Doré and metals from doré |  | $ | 313,337 |  |  | $ | 266,536 |  |  | $ | 340,912 |
Carbon |  |  | 4,117 |  |  |  | 60,302 |  |  |  | 37,645 |
Silver concentrate |  |  | 345,732 |  |  |  | 281,050 |  |  |  | 200,456 |
Zinc concentrate |  |  | 112,448 |  |  |  | 76,481 |  |  |  | 74,160 |
Precious metals concentrate |  |  | 32,382 |  |  |  | 23,884 |  |  |  | 21,376 |
Total, excluding gains/losses on forward contracts |  | $ | 808,016 |  |  | $ | 708,253 |  |  | $ | 674,549 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
CIBC |  |  | 37.2 | % |  |  | 32.7 | % |  |  | 23.1 | %
Teck Metals Ltd. |  |  | 21.5 | % |  |  | 16.1 | % |  |  | 8.2 | %
Ocean Partners |  |  | 6.2 | % |  |  | 13.9 | % |  |  | 5.7 | %
Korea Zinc |  |  | 21.6 | % |  |  | 13.3 | % |  |  | 17.4 | %
Scotia |  |  | — | % |  |  | 2.9 | % |  |  | 24.0 | %

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