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v3.25.1

Note 2 - Business Segments and Sales of Products (Details Textual) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 USD ($) Segment | Mar. 31, 2024 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 5.1 | $ 3.1
Number of Reportable Segments | Segment | 4 |
Lucky Friday [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Business interruption insurance proceeds received |  | 17.4
Keno Hill [Member] |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | $ 1.0 | $ 0.3

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