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Note 12 - Business Segments, Sales of Products and Significant Customers - Sales of Products (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Sales of products | $ 567,137 | $ 577,775 | $ 645,957
Less: Smelter and refining charges | (24,177) | (36,477) | (64,111)
Sales by significant product type | 559,053 | 583,758 | 660,193
Silver [Member] |  |  |
Sales of products | 144,609 | 194,813 | 274,438
Doré and Metals from Doré [Member] |  |  |
Sales by significant product type | 311,567 | 295,176 | 313,784
Gold [Member] |  |  |
Sales of products | 313,076 | 277,421 | 276,630
Lead Concentrate [Member] |  |  |
Sales by significant product type | 148,880 | 179,143 | 250,153
Lead [Member] |  |  |
Sales of products | 33,829 | 37,995 | 63,942
Zinc Concentrate [Member] |  |  |
Sales by significant product type | 80,938 | 88,688 | 82,872
Zinc [Member] |  |  |
Sales of products | 99,800 | 104,023 | 95,058
Bulk Concentrate [Member] |  |  |
Sales by significant product type | $ 17,668 | $ 20,751 | $ 13,384

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