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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, 2023 lb oz $ / USN $ / oz | Dec. 31, 2022 lb oz $ / USN $ / oz
Silver 2022 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 3,124
Underlying, Derivative Mass | $ / oz |  | 21.55
Silver 2023 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 735 |
Underlying, Derivative Mass | $ / oz | 24.4 |
Gold 2022 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 8
Underlying, Derivative Mass | $ / oz |  | 1,795
Gold 2023 Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 3 |
Underlying, Derivative Mass | $ / oz | 2,045 |
Zinc 2022 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 18,629
Underlying, Derivative Mass | $ / USN |  | 1.38
Lead 2022 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 11,960
Underlying, Derivative Mass | $ / USN |  | 0.98
Zinc 2022 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 37,533
Underlying, Derivative Mass | $ / USN |  | 1.34
Lead 2022 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 75,618
Underlying, Derivative Mass | $ / USN |  | 1
Zinc 2023 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 441 |
Underlying, Derivative Mass | $ / USN | 1.51 |
Lead 2023 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 49,273 | 45,856
Underlying, Derivative Mass | $ / USN | 0.98 | 0.99
Lead 2023 Settlements for Provisional Sales[Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 15,542 |
Underlying, Derivative Mass | $ / USN | 1 |
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 56,713 |
Underlying, Derivative Mass | $ / USN | 0.98 |

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