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Note 6 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net sales | $ 139,709 | $ 142,544
Income (loss) from operations | 11,949 | 15,871
Greens Creek [Member] |  |
Net sales | 65,850 | 58,850
Income (loss) from operations | 23,152 | 14,114
Lucky Friday [Member] |  |
Net sales | 4,977 | 20,010
Income (loss) from operations | (4,146) | 3,880
Casa Berardi [Member] |  |
Net sales | 55,548 | 41,712
Income (loss) from operations | 3,250 | (2,245)
San Sebastian [Member] |  |
Net sales | 13,334 | 21,972
Income (loss) from operations | 5,017 | 13,454
Other Segments [Member] |  |
Income (loss) from operations | $ (15,324) | $ (13,332)

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