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Note 6 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Net sales |  | $ 152,617 | $ 139,709 |
Income (loss) from operations |  | (16,124) | 11,949 |
Identifiable assets |  | 2,694,605 |  | $ 2,703,944
Greens Creek [Member] |  |  |  |
Net sales |  | 80,129 | 65,850 |
Income (loss) from operations |  | 25,433 | 23,152 |
Identifiable assets |  | 640,241 |  | 637,386
Lucky Friday [Member] |  |  |  |
Net sales |  | 2,182 | 4,977 |
Income (loss) from operations |  | (2,781) | (4,146) |
Identifiable assets |  | 440,433 |  | 437,499
Casa Berardi [Member] |  |  |  |
Net sales |  | 40,062 | 55,548 |
Income (loss) from operations | [1] | (10,519) | 3,250 |
Identifiable assets |  | 739,978 |  | 754,248
San Sebastian [Member] |  |  |  |
Net sales |  | 12,600 | 13,334 |
Income (loss) from operations |  | (1,512) | 5,017 |
Identifiable assets |  | 54,152 |  | 44,152
Nevada Operations [Member] |  |  |  |
Net sales |  | 17,644 |  |
Income (loss) from operations |  | (13,991) |  |
Identifiable assets |  | 575,197 |  | 581,194
Other Segments [Member] |  |  |  |
Income (loss) from operations |  | (12,754) | $ (15,324) |
Identifiable assets |  | $ 244,604 |  | $ 249,465
[1] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.

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