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Note 10 - Product Inventories - Schedule of Our Major Components of Product Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Product inventories | $ 45,200 | $ 34,962
Concentrates |  |
Inventory [Line Items] |  |
Product inventories | 24,255 | 15,030
Stockpiled ore |  |
Inventory [Line Items] |  |
Product inventories | 12,569 | 13,168
In-process |  |
Inventory [Line Items] |  |
Product inventories | $ 8,376 | $ 6,764

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