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Note 7 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Sales of products | $ 143,649 | $ 140,839 | $ 430,617 | $ 417,662
Less: Smelter and refining charges | (5,530) | (6,692) | (20,530) | (29,064)
Sales by significant product type | 138,627 | 141,465 | 422,284 | 421,574
Silver [Member] |  |  |  |
Sales of products | 38,009 | 43,228 | 111,656 | 140,662
Doré and Metals from Doré [Member] |  |  |  |
Sales by significant product type | 83,068 | 82,764 | 232,085 | 219,276
Gold [Member] |  |  |  |
Sales of products | 82,628 | 73,603 | 233,308 | 203,279
Lead Concentrate [Member] |  |  |  |
Sales by significant product type | 36,728 | 31,548 | 113,211 | 124,553
Lead [Member] |  |  |  |
Sales of products | 7,552 | 6,373 | 27,469 | 28,093
Zinc Concentrate [Member] |  |  |  |
Sales by significant product type | 14,965 | 21,278 | 63,197 | 61,841
Zinc [Member] |  |  |  |
Sales of products | 20,990 | 24,327 | 78,714 | 74,692
Bulk Concentrate [Member] |  |  |  |
Sales by significant product type | $ 3,866 | $ 5,875 | $ 13,791 | $ 15,904

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