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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Sales of products | $ 136,925 | $ 152,617
Less: Smelter and refining charges | (15,069) | (6,348)
Sales by significant product type | 135,245 | 155,093
Silver Contracts [Member] |  |
Sales of products | 37,572 | 45,506
Doré and Metals from Doré [Member] |  |
Sales by significant product type | 67,327 | 75,449
Gold [Member] |  |
Sales of products | 90,694 | 79,679
Carbon [Member] |  |
Sales by significant product type | 19,368 | 452
Lead [Member] |  |
Sales of products | 6,420 | 9,025
Lead Concentrate [Member] |  |
Sales by significant product type | 34,154 | 49,300
Zinc [Member] |  |
Sales of products | 17,308 | 24,755
Zinc Concentrate [Member] |  |
Sales by significant product type | 10,820 | 23,792
Bulk Concentrate [Member] |  |
Sales by significant product type | $ 3,576 | $ 6,100

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