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Note 6 - Business Segments and Sales of Products (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 53,833 |  |  | $ | 80,129 |
Lucky Friday |  |  | 2,830 |  |  |  | 2,182 |
Casa Berardi |  |  | 46,172 |  |  |  | 40,062 |
San Sebastian |  |  | 9,927 |  |  |  | 12,600 |
Nevada Operations |  |  | 24,163 |  |  |  | 17,644 |
|  | $ | 136,925 |  |  | $ | 152,617 |
Income (loss) from operations: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 4,117 |  |  | $ | 25,433 |
Lucky Friday |  |  | (8,120 | ) |  |  | (2,781 | )
Casa Berardi |  |  | (3,880 | ) |  |  | (10,519 | )
San Sebastian |  |  | 679 |  |  |  | (1,512 | )
Nevada Operations |  |  | 2,889 |  |  |  | (13,991 | )
Other |  |  | (10,645 | ) |  |  | (12,754 | )
|  | $ | (14,960 | ) |  | $ | (16,124 | )
|  | March 31, 2020 |  |  | December 31, 2019 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 631,246 |  |  | $ | 639,047 |
Lucky Friday |  |  | 488,854 |  |  |  | 440,615 |
Casa Berardi |  |  | 698,433 |  |  |  | 703,511 |
San Sebastian |  |  | 35,254 |  |  |  | 48,294 |
Nevada Operations |  |  | 522,899 |  |  |  | 528,466 |
Other |  |  | 387,438 |  |  |  | 277,375 |
|  | $ | 2,764,124 |  |  | $ | 2,637,308 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Greens Creek |  |  | 39 | % |  |  | 53 | %
Lucky Friday |  |  | 2 | % |  |  | 1 | %
Casa Berardi |  |  | 34 | % |  |  | 26 | %
San Sebastian |  |  | 7 | % |  |  | 8 | %
Nevada Operations |  |  | 18 | % |  |  | 12 | %
|  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Silver |  | $ | 37,572 |  |  | $ | 45,506 |
Gold |  |  | 90,694 |  |  |  | 79,679 |
Lead |  |  | 6,420 |  |  |  | 9,025 |
Zinc |  |  | 17,308 |  |  |  | 24,755 |
Less: Smelter and refining charges |  |  | (15,069 | ) |  |  | (6,348 | )
Sales of products |  | $ | 136,925 |  |  | $ | 152,617 |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Doré and metals from doré |  | $ | 67,327 |  |  | $ | 75,449 |
Carbon material |  |  | 19,368 |  |  |  | 452 |
Lead concentrate |  |  | 34,154 |  |  |  | 49,300 |
Zinc concentrate |  |  | 10,820 |  |  |  | 23,792 |
Bulk concentrate |  |  | 3,576 |  |  |  | 6,100 |
Total, excluding gains/losses on forward contracts |  | $ | 135,245 |  |  | $ | 155,093 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Canada |  | $ | 54,333 |  |  | $ | 92,872 |
Korea |  |  | 26,607 |  |  |  | 49,300 |
Japan |  |  | 6,121 |  |  |  | 8,350 |
China |  |  | 13,921 |  |  |  | — |
United States |  |  | 35,185 |  |  |  | 4,571 |
Other |  |  | (922 | ) |  |  | — |
Total, excluding gains/losses on forward contracts |  | $ | 135,245 |  |  | $ | 155,093 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
CIBC |  |  | 30 | % |  |  | 16 | %
Korea Zinc |  |  | 19 | % |  |  | 20 | %
Asahi |  |  | 17 | % |  |  | 2 | %
Scotia |  |  | 15 | % |  |  | 29 | %
IXM |  |  | 10 | % |  |  | — | %
Teck Metals Ltd. |  |  | 2 | % |  |  | 15 | %
Trafigura |  |  | — | % |  |  | 12 | %

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