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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Less: Smelter and refining charges | $ (41,273) | $ (50,909) | $ (51,973)
Total consolidated sales | 929,925 | 720,227 | 718,905
Silver Contracts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 413,980 | 302,284 | 265,054
Gold [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 318,256 | 274,613 | 298,910
Lead [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 87,223 | 72,726 | 83,384
Zinc [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 130,767 | 116,230 | 123,057
Copper [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 416 | 0 | 0
Total Metal [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | 909,369 | 714,944 | 718,432
Environmental Remediation Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated sales | $ 20,556 | $ 5,283 | $ 473

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