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Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 lb oz $ / $ $ / oz | Dec. 31, 2023 lb oz $ / $ $ / oz
Silver 2024 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 2,617 |
Underlying, Derivative Mass | $ / oz | 24.81 |
Silver 2023 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 | 9,060 |
Underlying, Derivative Mass | $ / oz | 2,165 |
Gold 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 3
Underlying, Derivative Mass | $ / oz |  | 2,045
Zinc 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 441
Underlying, Derivative Mass | $ / $ |  | 1.51
Lead 2024 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | 12,015 |
Underlying, Derivative Mass | $ / $ | 0.98 |
Lead 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 15,542
Underlying, Derivative Mass | $ / $ |  | 1
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | 45,691 | 56,713
Underlying, Derivative Mass | $ / $ | 0.98 | 0.98
Zinc 2025 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 0
Lead 2025 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | 43,541 | 49,273
Underlying, Derivative Mass | $ / $ | 0.98 | 0.98

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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