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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Sales of products | $ 139,709 | $ 142,544
Less: Smelter and refining charges | (7,893) | (14,998)
Sales by significant product type | 139,094 | 146,637
Silver [Member] |  |
Sales of products | 35,222 | 51,357
Doré and Metals from Doré [Member] |  |
Sales by significant product type | 73,492 | 68,981
Gold [Member] |  |
Sales of products | 73,044 | 62,701
Lead Concentrate [Member] |  |
Sales by significant product type | 34,334 | 48,917
Lead [Member] |  |
Sales of products | 9,227 | 13,619
Zinc Concentrate [Member] |  |
Sales by significant product type | 25,652 | 24,218
Zinc [Member] |  |
Sales of products | 30,109 | 29,865
Bulk Concentrate [Member] |  |
Sales by significant product type | $ 5,616 | $ 4,521

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