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Note 4 -Business Segments, Sales of Products and Significant Customers (Additional Information) (Details) $ in Thousands, oz in Millions, lb in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Segment oz lb | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 5 |  |
Derivative, loss on derivative | $ 19,700 | $ 5,800 | $ 500
Trade | 14,740 | 45,146 |
Allowance for doubtful accounts | $ 0 | $ 0 |
Derivative, loss, statement of income or comprehensive income [Extensible Enumeration] | Unrealized gain (loss) on derivative contracts designated as hedge transactions | Unrealized gain (loss) on derivative contracts designated as hedge transactions | Unrealized gain (loss) on derivative contracts designated as hedge transactions
Silver Contracts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | oz | 0.7 |  |
Gold [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | oz | 3,490.0 |  |
Zinc [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | lb | 0.4 |  |
Lead [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | lb | 12.0 |  |
Environmental Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 5,300 |  |

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