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Note 10 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 12 Months Ended
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Dec. 31, 2024 oz lb $ / £ $ / oz | Dec. 31, 2023 lb oz $ / £ $ / oz
Silver 2024 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 735
Underlying, Derivative Mass | $ / oz |  | 24.4
Gold 2024 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 3
Underlying, Derivative Mass | $ / oz |  | 2,045
Zinc 2024 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 441
Underlying, Derivative Mass | $ / £ |  | 1.51
Silver 2025 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 1,535 |
Underlying, Derivative Mass | $ / oz | 31.46 |
Gold 2025 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 2 |
Underlying, Derivative Mass | $ / oz | 2,673 |
Zinc 2025 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 20,834 |
Underlying, Derivative Mass | $ / £ | 1.4 |
Lead 2025 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 14,661 |
Underlying, Derivative Mass | $ / £ | 0.97 |
Lead 2024 Settlements for Provisional Sales[Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 15,542
Underlying, Derivative Mass | $ / £ |  | 1
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 56,713
Underlying, Derivative Mass | $ / £ |  | 0.98
Zinc 2025 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 59,194 |
Underlying, Derivative Mass | $ / £ | 1.39 |
Lead 2025 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 47,840 | 49,273
Underlying, Derivative Mass | $ / £ | 0.99 | 0.98
Zinc 2026 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 6,283 |
Underlying, Derivative Mass | $ / £ | 1.41 |
Lead 2026 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 52,911 |
Underlying, Derivative Mass | $ / £ | 1.03 |

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