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Note 6 - Business Segments and Sales of Products (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 80,129 |  |  | $ | 65,850 |
Lucky Friday |  |  | 2,182 |  |  |  | 4,977 |
Casa Berardi |  |  | 40,062 |  |  |  | 55,548 |
San Sebastian |  |  | 12,600 |  |  |  | 13,334 |
Nevada Operations |  |  | 17,644 |  |  |  | — |
|  | $ | 152,617 |  |  | $ | 139,709 |
Income (loss) from operations: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 25,433 |  |  | $ | 23,152 |
Lucky Friday |  |  | (2,781 | ) |  |  | (4,146 | )
Casa Berardi |  |  | (10,519 | ) |  |  | 3,250 |
San Sebastian |  |  | (1,512 | ) |  |  | 5,017 |
Nevada Operations |  |  | (13,991 | ) |  |  | — |
Other |  |  | (12,754 | ) |  |  | (15,324 | )
|  | $ | (16,124 | ) |  | $ | 11,949 |
|  | March 31, 2019 |  |  | December 31, 2018 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 640,241 |  |  | $ | 637,386 |
Lucky Friday |  |  | 440,433 |  |  |  | 437,499 |
Casa Berardi |  |  | 739,978 |  |  |  | 754,248 |
San Sebastian |  |  | 54,152 |  |  |  | 44,152 |
Nevada Operations |  |  | 575,197 |  |  |  | 581,194 |
Other |  |  | 244,604 |  |  |  | 249,465 |
|  | $ | 2,694,605 |  |  | $ | 2,703,944 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Greens Creek |  |  | 53 | % |  |  | 46 | %
Lucky Friday |  |  | 1 | % |  |  | 4 | %
Casa Berardi |  |  | 26 | % |  |  | 40 | %
San Sebastian |  |  | 8 | % |  |  | 10 | %
Nevada Operations |  |  | 12 | % |  |  | — | %
|  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Silver |  | $ | 45,506 |  |  | $ | 35,222 |
Gold |  |  | 79,679 |  |  |  | 73,044 |
Lead |  |  | 9,025 |  |  |  | 9,227 |
Zinc |  |  | 24,755 |  |  |  | 30,109 |
Less: Smelter and refining charges |  |  | (6,348 | ) |  |  | (7,893 | )
Sales of products |  | $ | 152,617 |  |  | $ | 139,709 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Canada |  | $ | 92,872 |  |  | $ | 88,668 |
Korea |  |  | 49,300 |  |  |  | 32,703 |
Japan |  |  | 8,350 |  |  |  | 13,773 |
United States |  |  | 4,571 |  |  |  | 4,081 |
Other |  |  | — |  |  |  | (131 | )
Total, excluding gains/losses on forward contracts |  | $ | 155,093 |  |  | $ | 139,094 |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Doré and metals from doré |  | $ | 75,901 |  |  | $ | 73,492 |
Lead concentrate |  |  | 49,300 |  |  |  | 34,334 |
Zinc concentrate |  |  | 23,792 |  |  |  | 25,652 |
Bulk concentrate |  |  | 6,100 |  |  |  | 5,616 |
Total, excluding gains/losses on forward contracts |  | $ | 155,093 |  |  | $ | 139,094 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
CIBC |  |  | 16 | % |  |  | 47 | %
Scotia |  |  | 29 | % |  |  | 2 | %
Korea Zinc |  |  | 20 | % |  |  | 23 | %
Teck Metals Ltd. |  |  | 15 | % |  |  | 4 | %
Trafigura |  |  | 12 | % |  |  | — | %
Ocean Partners |  |  | — | % |  |  | 10 | %

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