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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Sales of products | $ 161,532 | $ 143,649 | $ 448,321 | $ 430,617
Less: Smelter and refining charges | (5,351) | (5,530) | (21,609) | (20,530)
Sales by significant product type | 160,484 | 138,627 | 448,458 | 422,284
Silver Contracts [Member] |  |  |  |
Sales of products | 40,588 | 38,009 | 122,392 | 111,656
Doré and Metals from Doré [Member] |  |  |  |
Sales by significant product type | 87,525 | 80,074 | 231,391 | 227,812
Gold [Member] |  |  |  |
Sales of products | 103,889 | 82,628 | 261,734 | 233,308
Carbon [Member] |  |  |  |
Sales by significant product type | 17,745 | 2,994 | 27,376 | 4,273
Lead [Member] |  |  |  |
Sales of products | 7,114 | 7,552 | 22,809 | 27,469
Lead Concentrate [Member] |  |  |  |
Sales by significant product type | 37,685 | 36,728 | 122,727 | 113,211
Zinc [Member] |  |  |  |
Sales of products | 15,292 | 20,990 | 62,995 | 78,714
Zinc Concentrate [Member] |  |  |  |
Sales by significant product type | 12,345 | 14,965 | 51,876 | 63,197
Bulk Concentrate [Member] |  |  |  |
Sales by significant product type | $ 5,184 | $ 3,866 | $ 15,088 | $ 13,791

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