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Note 6 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Net sales | $ 161,532 | $ 143,649 | $ 448,321 | $ 430,617 |
Income (loss) from operations | (5,113) | (30,376) | (64,714) | (14,671) |
Identifiable assets | 2,673,178 |  | 2,673,178 |  | $ 2,703,944
Greens Creek [Member] |  |  |  |  |
Net sales | 59,015 | 65,187 | 194,542 | 205,642 |
Income (loss) from operations | 17,556 | 10,705 | 52,130 | 59,373 |
Identifiable assets | 648,420 |  | 648,420 |  | 637,386
Lucky Friday [Member] |  |  |  |  |
Net sales | 4,017 | (11) | 11,150 | 8,253 |
Income (loss) from operations | (3,727) | (5,404) | (8,779) | (14,811) |
Identifiable assets | 438,946 |  | 438,946 |  | 437,499
Casa Berardi [Member] |  |  |  |  |
Net sales | 53,453 | 52,850 | 139,015 | 164,501 |
Income (loss) from operations | (380) | (1,146) | (26,262) | 3,118 |
Identifiable assets | 717,631 |  | 717,631 |  | 754,248
San Sebastian [Member] |  |  |  |  |
Net sales | 15,435 | 14,129 | 39,028 | 40,727 |
Income (loss) from operations | 1,077 | (2,381) | (2,358) | 2,275 |
Identifiable assets | 50,549 |  | 50,549 |  | 44,152
Nevada Operations [Member] |  |  |  |  |
Net sales | 29,612 | 11,494 | 64,586 | 11,494 |
Income (loss) from operations | (8,346) | (13,741) | (43,812) | (13,741) |
Identifiable assets | 558,219 |  | 558,219 |  | 581,194
Other Segments [Member] |  |  |  |  |
Income (loss) from operations | (11,293) | $ (18,409) | (35,633) | $ (50,885) |
Identifiable assets | $ 259,413 |  | $ 259,413 |  | $ 249,465

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