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Note 6 - Business Segments - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Sales of products |  | $ 140,839 | $ 179,393 | $ 417,662 | $ 481,712
Income (loss) from operations |  | 20,942 | 38,240 | 40,788 | 95,422
Greens Creek [Member] |  |  |  |  |
Sales of products |  | 61,061 | 85,804 | 191,250 | 199,260
Income (loss) from operations |  | 16,575 | 26,498 | 46,107 | 49,407
Lucky Friday [Member] |  |  |  |  |
Sales of products | [1] | 199 | 26,140 | 20,022 | 70,152
Income (loss) from operations |  | (4,642) | 6,652 | (8,974) | 13,442
Casa Berardi [Member] |  |  |  |  |
Sales of products |  | 53,990 | 41,131 | 139,524 | 126,614
Income (loss) from operations |  | 2,882 | 3,691 | (1,071) | 16,246
San Sebastian [Member] |  |  |  |  |
Sales of products |  | 25,589 | 26,318 | 66,866 | 85,686
Income (loss) from operations |  | 17,017 | 18,415 | 42,363 | 58,911
Other Segments [Member] |  |  |  |  |
Income (loss) from operations |  | $ (10,890) | $ (17,016) | $ (37,637) | $ (42,584)
[1] | The $0.2 million in sales reported for Lucky Friday for the third quarter of 2017 represents gains on base metal derivatives contracts.

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