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Note 6 - Business Segments - Information about Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Sales of products | $ 142,544 | $ 131,017
Income from operations | 15,871 | 15,573
Greens Creek [Member] |  |
Sales of products | 58,850 | 53,882
Income from operations | 14,114 | 8,078
Lucky Friday [Member] |  |
Sales of products | 20,010 | 21,252
Income from operations | 3,880 | 2,743
Casa Berardi [Member] |  |
Sales of products | 41,712 | 32,198
Income from operations | (2,245) | 1,934
San Sebastian [Member] |  |
Sales of products | 21,972 | 23,685
Income from operations | 13,454 | 14,912
Other Segments [Member] |  |
Income from operations | $ (13,332) | $ (12,094)

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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