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Note 6 - Business Segments and Sales of Products (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 65,850 |  |  | $ | 58,850 |
Lucky Friday |  |  | 4,977 |  |  |  | 20,010 |
Casa Berardi |  |  | 55,548 |  |  |  | 41,712 |
San Sebastian |  |  | 13,334 |  |  |  | 21,972 |
|  | $ | 139,709 |  |  | $ | 142,544 |
Income (loss) from operations: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 23,152 |  |  | $ | 14,114 |
Lucky Friday |  |  | (4,146 | ) |  |  | 3,880 |
Casa Berardi |  |  | 3,250 |  |  |  | (2,245 | )
San Sebastian |  |  | 5,017 |  |  |  | 13,454 |
Other |  |  | (15,324 | ) |  |  | (13,332 | )
|  | $ | 11,949 |  |  | $ | 15,871 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | March 31, 2018 |  |  | December 31, 2017 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 669,042 |  |  | $ | 671,960 |
Lucky Friday |  |  | 432,369 |  |  |  | 432,400 |
Casa Berardi |  |  | 802,017 |  |  |  | 804,505 |
San Sebastian |  |  | 67,576 |  |  |  | 62,198 |
Other |  |  | 427,087 |  |  |  | 393,894 |
|  | $ | 2,398,091 |  |  | $ | 2,364,957 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Greens Creek |  |  | 46 | % |  |  | 41 | %
Lucky Friday |  |  | 4 | % |  |  | 14 | %
Casa Berardi |  |  | 40 | % |  |  | 29 | %
San Sebastian |  |  | 10 | % |  |  | 16 | %
|  |  | 100 | % |  |  | 100 | %
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Silver |  | $ | 35,222 |  |  | $ | 51,357 |
Gold |  |  | 73,044 |  |  |  | 62,701 |
Lead |  |  | 9,227 |  |  |  | 13,619 |
Zinc |  |  | 30,109 |  |  |  | 29,865 |
Less: Smelter and refining charges |  |  | (7,893 | ) |  |  | (14,998 | )
|  |  | 139,709 |  |  |  | 142,544 |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Doré and metals from doré |  | $ | 73,492 |  |  | $ | 68,981 |
Lead concentrate |  |  | 34,334 |  |  |  | 48,917 |
Zinc concentrate |  |  | 25,652 |  |  |  | 24,218 |
Bulk concentrate |  |  | 5,616 |  |  |  | 4,521 |
Total, excluding gains/losses on forward contracts |  |  | 139,094 |  |  |  | 146,637 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Canada |  | $ | 88,668 |  |  | $ | 100,219 |
Korea |  |  | 32,703 |  |  |  | 28,971 |
Japan |  |  | 13,773 |  |  |  | 12,290 |
United States |  |  | 4,081 |  |  |  | 5,205 |
Other |  |  | (131 | ) |  |  | (48 | )
Total, excluding gains/losses on forward contracts |  |  | 139,094 |  |  |  | 146,637 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
CIBC |  |  | 47 | % |  |  | 24 | %
Scotia |  |  | 2 | % |  |  | 20 | %
Korea Zinc |  |  | 23 | % |  |  | 20 | %
Teck Metals Ltd. |  |  | 4 | % |  |  | 15 | %
Ocean Partners |  |  | 10 | % |  |  | 10 | %

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