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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Sales of products | $ 691,873 | $ 673,266 | $ 567,137
Less: Smelter and refining charges | (68,361) | (33,004) | (24,177)
Sales by significant product type | 708,253 | 674,549 | 559,053
Silver Contracts [Member] |  |  |
Sales of products | 260,227 | 192,235 | 144,609
Doré and Metals from Doré [Member] |  |  |
Sales by significant product type | 266,536 | 340,912 | 306,328
Gold [Member] |  |  |
Sales of products | 356,166 | 388,602 | 313,076
Carbon [Member] |  |  |
Sales by significant product type | 60,302 | 37,645 | 5,239
Lead [Member] |  |  |
Sales of products | 48,776 | 35,777 | 33,829
Lead Concentrate [Member] |  |  |
Sales by significant product type | 281,050 | 200,456 | 148,880
Zinc [Member] |  |  |
Sales of products | 95,065 | 89,656 | 99,800
Zinc Concentrate [Member] |  |  |
Sales by significant product type | 76,481 | 74,160 | 80,938
Bulk Concentrate [Member] |  |  |
Sales by significant product type | $ 23,884 | $ 21,376 | $ 17,668

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