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Note 4 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales of Products by Metal (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Less: Smelter and refining charges | $ (50,909) | $ (51,973) | $ (48,933)
Total sales | 720,227 | 718,905 | 807,473
Silver Contracts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 302,284 | 265,054 | 293,646
Gold [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 274,613 | 298,910 | 362,037
Lead [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 72,726 | 83,384 | 75,431
Zinc [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 116,230 | 123,057 | 125,292
Total Metal [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | 714,944 | 718,432 | 807,473
Environmental Remediation Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total sales | $ 5,283 | $ 473 | $ 0

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