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Note 7 - Business Segments and Sales of Products (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 65,187 |  |  | $ | 61,062 |  |  | $ | 205,642 |  |  | $ | 191,250 |
Lucky Friday |  |  | (11 | ) |  |  | 199 |  |  |  | 8,253 |  |  |  | 20,022 |
Casa Berardi |  |  | 52,850 |  |  |  | 53,989 |  |  |  | 164,501 |  |  |  | 139,524 |
San Sebastian |  |  | 14,129 |  |  |  | 25,589 |  |  |  | 40,727 |  |  |  | 66,866 |
Nevada Operations |  |  | 11,494 |  |  |  | — |  |  |  | 11,494 |  |  |  | — |
|  | $ | 143,649 |  |  | $ | 140,839 |  |  | $ | 430,617 |  |  | $ | 417,662 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 10,705 |  |  | $ | 16,575 |  |  | $ | 59,373 |  |  | $ | 46,107 |
Lucky Friday |  |  | (5,404 | ) |  |  | (4,642 | ) |  |  | (14,811 | ) |  |  | (8,974 | )
Casa Berardi |  |  | (1,146 | ) |  |  | 2,208 |  |  |  | 3,118 |  |  |  | (4,692 | )
San Sebastian |  |  | (2,381 | ) |  |  | 17,017 |  |  |  | 2,275 |  |  |  | 42,363 |
Nevada Operations |  |  | (13,741 | ) |  |  | — |  |  |  | (13,741 | ) |  |  | — |
Other |  |  | (18,409 | ) |  |  | (10,890 | ) |  |  | (50,885 | ) |  |  | (37,637 | )
|  | $ | (30,376 | ) |  | $ | 20,268 |  |  | $ | (14,671 | ) |  | $ | 37,167 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | September 30, 2018 |  |  | December 31, 2017 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 651,814 |  |  | $ | 671,960 |
Lucky Friday |  |  | 429,334 |  |  |  | 432,400 |
Casa Berardi |  |  | 758,415 |  |  |  | 784,706 |
San Sebastian |  |  | 47,352 |  |  |  | 62,198 |
Nevada Operations |  |  | 539,410 |  |  |  | — |
Other |  |  | 283,933 |  |  |  | 393,894 |
|  | $ | 2,710,258 |  |  | $ | 2,345,158 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Greens Creek |  |  | 45 | % |  |  | 43 | % |  |  | 48 | % |  |  | 46 | %
Lucky Friday |  |  | — | % |  |  | — | % |  |  | 2 | % |  |  | 5 | %
Casa Berardi |  |  | 37 | % |  |  | 38 | % |  |  | 39 | % |  |  | 33 | %
San Sebastian |  |  | 10 | % |  |  | 19 | % |  |  | 9 | % |  |  | 16 | %
Nevada Operations |  |  | 8 | % |  |  | — | % |  |  | 2 | % |  |  | — | %
|  |  | 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, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Silver |  | $ | 38,009 |  |  | $ | 43,228 |  |  | $ | 111,656 |  |  | $ | 140,662 |
Gold |  |  | 82,628 |  |  |  | 73,603 |  |  |  | 233,308 |  |  |  | 203,279 |
Lead |  |  | 7,552 |  |  |  | 6,373 |  |  |  | 27,469 |  |  |  | 28,093 |
Zinc |  |  | 20,990 |  |  |  | 24,327 |  |  |  | 78,714 |  |  |  | 74,692 |
Less: Smelter and refining charges |  |  | (5,530 | ) |  |  | (6,692 | ) |  |  | (20,530 | ) |  |  | (29,064 | )
Sales of products |  | $ | 143,649 |  |  | $ | 140,839 |  |  | $ | 430,617 |  |  | $ | 417,662 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Doré and metals from doré |  | $ | 83,068 |  |  | $ | 82,764 |  |  | $ | 232,085 |  |  | $ | 219,276 |
Lead concentrate |  |  | 36,728 |  |  |  | 31,548 |  |  |  | 113,211 |  |  |  | 124,553 |
Zinc concentrate |  |  | 14,965 |  |  |  | 21,278 |  |  |  | 63,197 |  |  |  | 61,841 |
Bulk concentrate |  |  | 3,866 |  |  |  | 5,875 |  |  |  | 13,791 |  |  |  | 15,904 |
Total, excluding gains/losses on forward contracts |  | $ | 138,627 |  |  | $ | 141,465 |  |  | $ | 422,284 |  |  | $ | 421,574 |
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, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Canada |  | $ | 83,723 |  |  | $ | 79,834 |  |  | $ | 266,915 |  |  | $ | 263,268 |
Korea |  |  | 35,796 |  |  |  | 27,396 |  |  |  | 110,036 |  |  |  | 75,339 |
Japan |  |  | 3,301 |  |  |  | 14,419 |  |  |  | 20,971 |  |  |  | 38,513 |
China |  |  | — |  |  |  | 16,695 |  |  |  | 66 |  |  |  | 32,047 |
United States |  |  | 15,807 |  |  |  | 3,121 |  |  |  | 24,296 |  |  |  | 12,407 |
Total, excluding gains/losses on forward contracts |  | $ | 138,627 |  |  | $ | 141,465 |  |  | $ | 422,284 |  |  | $ | 421,574 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
CIBC |  |  | 26 | % |  |  | 23 | % |  |  | 34 | % |  |  | 24 | %
Scotia |  |  | 19 | % |  |  | 33 | % |  |  | 13 | % |  |  | 26 | %
Korea Zinc |  |  | 15 | % |  |  | 25 | % |  |  | 22 | % |  |  | 20 | %
Teck Metals Ltd. |  |  | 11 | % |  |  | — | % |  |  | 11 | % |  |  | 10 | %
Trafigura |  |  | 10 | % |  |  | — | % |  |  | 3 | % |  |  | 4 | %
Louis Dreyfus |  |  | — | % |  |  | 12 | % |  |  | — | % |  |  | 4 | %

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