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Note 2 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | $ 189,528 | $ 199,500
Less: Smelter and refining charges | (13,014) | (15,973)
Silver Contracts [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | 86,233 | 81,532
Gold [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | 67,415 | 75,087
Lead [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | 19,483 | 25,402
Zinc [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | 24,964 | 32,943
Total Metal [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | 185,081 | 198,991
Environmental Remediation Services [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Total sales | $ 4,447 | $ 509

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