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Note 6 - Business Segments and Sales of Products (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Net sales to unaffiliated customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 59,015 |  |  | $ | 65,187 |  |  | $ | 194,542 |  |  | $ | 205,642 |
Lucky Friday |  |  | 4,017 |  |  |  | (11 | ) |  |  | 11,150 |  |  |  | 8,253 |
Casa Berardi |  |  | 53,453 |  |  |  | 52,850 |  |  |  | 139,015 |  |  |  | 164,501 |
San Sebastian |  |  | 15,435 |  |  |  | 14,129 |  |  |  | 39,028 |  |  |  | 40,727 |
Nevada Operations |  |  | 29,612 |  |  |  | 11,494 |  |  |  | 64,586 |  |  |  | 11,494 |
|  | $ | 161,532 |  |  | $ | 143,649 |  |  | $ | 448,321 |  |  | $ | 430,617 |
Income (loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greens Creek |  | $ | 17,556 |  |  | $ | 10,705 |  |  | $ | 52,130 |  |  | $ | 59,373 |
Lucky Friday |  |  | (3,727 | ) |  |  | (5,404 | ) |  |  | (8,779 | ) |  |  | (14,811 | )
Casa Berardi |  |  | (380 | ) |  |  | (1,146 | ) |  |  | (26,262 | ) |  |  | 3,118 |
San Sebastian |  |  | 1,077 |  |  |  | (2,381 | ) |  |  | (2,358 | ) |  |  | 2,275 |
Nevada Operations |  |  | (8,346 | ) |  |  | (13,741 | ) |  |  | (43,812 | ) |  |  | (13,741 | )
Other |  |  | (11,293 | ) |  |  | (18,409 | ) |  |  | (35,633 | ) |  |  | (50,885 | )
|  | $ | (5,113 | ) |  | $ | (30,376 | ) |  | $ | (64,714 | ) |  | $ | (14,671 | )
|  | September 30, 2019 |  |  | December 31, 2018 |
Identifiable assets: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 648,420 |  |  | $ | 637,386 |
Lucky Friday |  |  | 438,946 |  |  |  | 437,499 |
Casa Berardi |  |  | 717,631 |  |  |  | 754,248 |
San Sebastian |  |  | 50,549 |  |  |  | 44,152 |
Nevada Operations |  |  | 558,219 |  |  |  | 581,194 |
Other |  |  | 259,413 |  |  |  | 249,465 |
|  | $ | 2,673,178 |  |  | $ | 2,703,944 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Greens Creek |  |  | 37 | % |  |  | 45 | % |  |  | 44 | % |  |  | 48 | %
Lucky Friday |  |  | 2 | % |  |  | — | % |  |  | 2 | % |  |  | 2 | %
Casa Berardi |  |  | 33 | % |  |  | 37 | % |  |  | 31 | % |  |  | 39 | %
San Sebastian |  |  | 10 | % |  |  | 10 | % |  |  | 9 | % |  |  | 9 | %
Nevada Operations |  |  | 18 | % |  |  | 8 | % |  |  | 14 | % |  |  | 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, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Silver |  | $ | 40,588 |  |  | $ | 38,009 |  |  | $ | 122,392 |  |  | $ | 111,656 |
Gold |  |  | 103,889 |  |  |  | 82,628 |  |  |  | 261,734 |  |  |  | 233,308 |
Lead |  |  | 7,114 |  |  |  | 7,552 |  |  |  | 22,809 |  |  |  | 27,469 |
Zinc |  |  | 15,292 |  |  |  | 20,990 |  |  |  | 62,995 |  |  |  | 78,714 |
Less: Smelter and refining charges |  |  | (5,351 | ) |  |  | (5,530 | ) |  |  | (21,609 | ) |  |  | (20,530 | )
Sales of products |  | $ | 161,532 |  |  | $ | 143,649 |  |  | $ | 448,321 |  |  | $ | 430,617 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Doré and metals from doré |  | $ | 87,525 |  |  | $ | 80,074 |  |  | $ | 231,391 |  |  | $ | 227,812 |
Carbon |  |  | 17,745 |  |  |  | 2,994 |  |  |  | 27,376 |  |  |  | 4,273 |
Lead concentrate |  |  | 37,685 |  |  |  | 36,728 |  |  |  | 122,727 |  |  |  | 113,211 |
Zinc concentrate |  |  | 12,345 |  |  |  | 14,965 |  |  |  | 51,876 |  |  |  | 63,197 |
Bulk concentrate |  |  | 5,184 |  |  |  | 3,866 |  |  |  | 15,088 |  |  |  | 13,791 |
Total, excluding gains/losses on derivative contracts |  | $ | 160,484 |  |  | $ | 138,627 |  |  | $ | 448,458 |  |  | $ | 422,284 |
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, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Canada |  | $ | 88,610 |  |  | $ | 83,723 |  |  | $ | 258,708 |  |  | $ | 266,915 |
Korea |  |  | 33,683 |  |  |  | 35,796 |  |  |  | 109,184 |  |  |  | 110,036 |
Japan |  |  | 17,339 |  |  |  | 3,301 |  |  |  | 34,924 |  |  |  | 20,971 |
Netherlands |  |  | 445 |  |  |  | — |  |  |  | 16,500 |  |  |  | — |
China |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 66 |
United States |  |  | 20,407 |  |  |  | 15,807 |  |  |  | 29,142 |  |  |  | 24,296 |
Total, excluding gains/losses on derivative contracts |  | $ | 160,484 |  |  | $ | 138,627 |  |  | $ | 448,458 |  |  | $ | 422,284 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
CIBC |  |  | 36 | % |  |  | 26 | % |  |  | 24 | % |  |  | 34 | %
Scotia |  |  | 18 | % |  |  | 19 | % |  |  | 26 | % |  |  | 13 | %
Korea Zinc |  |  | 9 | % |  |  | 15 | % |  |  | 16 | % |  |  | 22 | %
Teck Metals Ltd. |  |  | 3 | % |  |  | 11 | % |  |  | 7 | % |  |  | 11 | %
Cliveden |  |  | 12 | % |  |  | — | % |  |  | 4 | % |  |  | — | %
Trafigura |  |  | — | % |  |  | 10 | % |  |  | 4 | % |  |  | 3 | %

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