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Note 4 -Business Segments, Sales of Products and Significant Customers (Additional Information) (Details) $ in Thousands, oz in Millions, T in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) Segment T oz | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Writedown of property, plant and equipment | $ 14,574 | $ 0 | $ 0
Derivative, loss on derivative | 1,300 | 19,700 | 5,800
Actual Costs of Work Performed | 8,800 | 3,600 | 400
Trade | 31,515 | 19,425 | 45,100
Allowance for doubtful accounts | $ 0 | $ 0 | $ 0
Derivative, loss, statement of income or comprehensive income [Extensible Enumeration] | Unrealized (loss) gain on derivative contracts designated as hedge transactions | Unrealized (loss) gain on derivative contracts designated as hedge transactions | Unrealized (loss) gain on derivative contracts designated as hedge transactions
Debt Instrument, Payment Terms | Payment terms are 30 days after receipt of an invoice by CIRNAC. CIRNAC has the ability to cancel the contract with or without cause by providing written notice to the Company. ERDC is owed for work performed as of the date of cancellation. |  |
Property Plant And Mine Development Member |  |  |
Segment Reporting Information [Line Items] |  |  |
Writedown of property, plant and equipment | $ 14,600 |  |
Lucky Friday [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Business interruption insurance proceeds received | 50,000 |  |
Writedown of property, plant and equipment | $ 13,900 |  |
Silver Contracts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | oz | 1.5 |  |
Gold [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | oz | 2,000.0 |  |
Zinc [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | T | 39,150 |  |
Lead [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Metals contained in concentrates (Ounce) | T | 52,350 |  |

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