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Note 6 - Business Segments and Sales of Products (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 93,494 |  |  | $ | 59,015 |  |  | $ | 232,218 |  |  | $ | 194,542 |
Lucky Friday |  |  | 20,812 |  |  |  | 4,017 |  |  |  | 35,097 |  |  |  | 11,150 |
Casa Berardi |  |  | 53,554 |  |  |  | 53,453 |  |  |  | 149,731 |  |  |  | 139,015 |
San Sebastian |  |  | 9,138 |  |  |  | 15,435 |  |  |  | 23,998 |  |  |  | 39,028 |
Nevada Operations |  |  | 22,705 |  |  |  | 29,612 |  |  |  | 61,939 |  |  |  | 64,586 |
|  | $ | 199,703 |  |  | $ | 161,532 |  |  | $ | 502,983 |  |  | $ | 448,321 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 41,527 |  |  | $ | 17,556 |  |  | $ | 72,394 |  |  | $ | 52,130 |
Lucky Friday |  |  | 957 |  |  |  | (3,727 | ) |  |  | (12,381 | ) |  |  | (8,779 | )
Casa Berardi |  |  | (828 | ) |  |  | (380 | ) |  |  | (1,504 | ) |  |  | (26,262 | )
San Sebastian |  |  | 1,946 |  |  |  | 1,077 |  |  |  | 1,766 |  |  |  | (2,358 | )
Nevada Operations |  |  | 5,489 |  |  |  | (8,346 | ) |  |  | 6,112 |  |  |  | (43,812 | )
Other |  |  | (17,762 | ) |  |  | (11,293 | ) |  |  | (40,144 | ) |  |  | (35,633 | )
|  | $ | 31,329 |  |  | $ | (5,113 | ) |  | $ | 26,243 |  |  | $ | (64,714 | )
|  | September 30, 2020 |  |  | December 31, 2019 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 612,963 |  |  | $ | 639,047 |
Lucky Friday |  |  | 508,053 |  |  |  | 440,615 |
Casa Berardi |  |  | 695,629 |  |  |  | 703,511 |
San Sebastian |  |  | 35,973 |  |  |  | 48,294 |
Nevada Operations |  |  | 520,871 |  |  |  | 528,466 |
Other |  |  | 241,661 |  |  |  | 277,375 |
|  | $ | 2,615,150 |  |  | $ | 2,637,308 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Greens Creek |  |  | 47 | % |  |  | 37 | % |  |  | 46 | % |  |  | 44 | %
Lucky Friday |  |  | 10 | % |  |  | 2 | % |  |  | 7 | % |  |  | 2 | %
Casa Berardi |  |  | 27 | % |  |  | 33 | % |  |  | 30 | % |  |  | 31 | %
San Sebastian |  |  | 5 | % |  |  | 10 | % |  |  | 5 | % |  |  | 9 | %
Nevada Operations |  |  | 11 | % |  |  | 18 | % |  |  | 12 | % |  |  | 14 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Silver |  | $ | 79,684 |  |  | $ | 40,588 |  |  | $ | 179,013 |  |  | $ | 122,392 |
Gold |  |  | 98,457 |  |  |  | 103,889 |  |  |  | 278,363 |  |  |  | 261,734 |
Lead |  |  | 13,370 |  |  |  | 7,114 |  |  |  | 32,244 |  |  |  | 22,809 |
Zinc |  |  | 26,779 |  |  |  | 15,292 |  |  |  | 65,540 |  |  |  | 62,995 |
Less: Smelter and refining charges |  |  | (18,587 | ) |  |  | (5,351 | ) |  |  | (52,177 | ) |  |  | (21,609 | )
Sales of products |  | $ | 199,703 |  |  | $ | 161,532 |  |  | $ | 502,983 |  |  | $ | 448,321 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Doré and metals from doré |  | $ | 67,659 |  |  | $ | 87,525 |  |  | $ | 211,439 |  |  | $ | 231,391 |
Carbon |  |  | 23,835 |  |  |  | 17,745 |  |  |  | 43,099 |  |  |  | 27,376 |
Lead concentrate |  |  | 85,511 |  |  |  | 37,685 |  |  |  | 192,179 |  |  |  | 122,727 |
Zinc concentrate |  |  | 24,322 |  |  |  | 12,345 |  |  |  | 51,727 |  |  |  | 51,876 |
Bulk concentrate |  |  | 7,935 |  |  |  | 5,184 |  |  |  | 17,417 |  |  |  | 15,088 |
Total, excluding gains/losses on derivative contracts |  | $ | 209,262 |  |  | $ | 160,484 |  |  | $ | 515,861 |  |  | $ | 448,458 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Canada |  | $ | 80,410 |  |  | $ | 88,610 |  |  | $ | 89,998 |  |  | $ | 258,708 |
Korea |  |  | 78,152 |  |  |  | 33,683 |  |  |  | 129,939 |  |  |  | 109,184 |
Japan |  |  | 14,337 |  |  |  | 17,339 |  |  |  | 32,071 |  |  |  | 34,924 |
Netherlands |  |  | — |  |  |  | 445 |  |  |  | (923 | ) |  |  | 16,500 |
China |  |  | 2,736 |  |  |  | — |  |  |  | 41,744 |  |  |  | — |
United States |  |  | 33,627 |  |  |  | 20,407 |  |  |  | 223,032 |  |  |  | 29,142 |
Total, excluding gains/losses on derivative contracts |  | $ | 209,262 |  |  | $ | 160,484 |  |  | $ | 515,861 |  |  | $ | 448,458 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
CIBC |  |  | 31 | % |  |  | 36 | % |  |  | 31 | % |  |  | 24 | %
Ocean Partners |  |  | 25 | % |  |  | — | % |  |  | 10 | % |  |  | — | %
Korea Zinc |  |  | 15 | % |  |  | 9 | % |  |  | 16 | % |  |  | 16 | %
Teck Metals Ltd. |  |  | 12 | % |  |  | 3 | % |  |  | 12 | % |  |  | 7 | %
Scotia |  |  | — | % |  |  | 18 | % |  |  | 4 | % |  |  | 26 | %
Cliveden |  |  | — | % |  |  | 12 | % |  |  | — | % |  |  | 4 | %

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