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Note 3 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales of Products by Metal (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Less: Smelter and refining charges | $ (51,973) | $ (48,933) | $ (68,361)
Net sales | 718,905 | 807,473 | 691,873
Sales of products | 718,432 | 807,473 | 691,873
Silver Contracts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 265,054 | 293,646 | 260,227
Gold [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 298,910 | 362,037 | 356,166
Lead [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 83,384 | 75,431 | 48,776
Zinc [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 123,057 | $ 125,292 | $ 95,065

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