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Note 6 - Business Segments (Details) - Information about Reportable Segments - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Net sales to unaffiliated customers: |  |  |  |  |
Net sales to unaffiliated customers | $ 104,941 | $ 135,507 | $ 328,230 | $ 378,796 |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | (21,197) | 6,271 | (33,565) | 19,215 |
Identifiable assets: |  |  |  |  |
Identifiable assets | 2,285,213 |  | 2,285,213 |  | $ 2,262,064
Greens Creek [Member] |  |  |  |  |
Net sales to unaffiliated customers: |  |  |  |  |
Net sales to unaffiliated customers | 54,351 | 67,763 | 175,749 | 186,808 |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | 21 | 8,874 | 24,664 | 28,724 |
Identifiable assets: |  |  |  |  |
Identifiable assets | 702,244 |  | 702,244 |  | 704,121
Lucky Friday [Member] |  |  |  |  |
Net sales to unaffiliated customers: |  |  |  |  |
Net sales to unaffiliated customers | 13,916 | 27,883 | 48,376 | 71,740 |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | (3,894) | 9,007 | (933) | 20,105 |
Identifiable assets: |  |  |  |  |
Identifiable assets | 389,700 |  | 389,700 |  | 356,482
Casa Berardi [Member] |  |  |  |  |
Net sales to unaffiliated customers: |  |  |  |  |
Net sales to unaffiliated customers | 36,674 | 39,861 | 104,105 | 120,248 |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | (2,603) | 395 | (6,567) | 4,940 |
Identifiable assets: |  |  |  |  |
Identifiable assets | 776,442 |  | 776,442 |  | 800,961
San Sebastian [Member] |  |  |  |  |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | (2,420) | (1,614) | (7,269) | (3,511) |
Identifiable assets: |  |  |  |  |
Identifiable assets | 2,612 |  | 2,612 |  | 1,529
Other Segments [Member] |  |  |  |  |
Income (loss) from operations: |  |  |  |  |
Income (loss) from operations | (12,301) | $ (10,391) | (43,460) | $ (31,043) |
Identifiable assets: |  |  |  |  |
Identifiable assets | $ 414,215 |  | $ 414,215 |  | $ 398,971

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