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Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) lb in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 lb oz $ / £ $ / oz | Dec. 31, 2024 lb oz $ / £ $ / oz
Silver Two Thousand Twenty Five Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 1,848,000 | 1,535,000
Underlying, Derivative Mass | $ / oz | 32.74 | 31.46
Gold Two Thousand Twenty Five Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 5 | 2
Underlying, Derivative Mass | $ / oz | 2,937 | 2,673
Zinc Two Thousand Twenty Five Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 15,487 | 20,834
Underlying, Derivative Mass | $ / £ | 1.39 | 1.4
Lead Two Thousand Twenty Five Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 13,889 | 14,661
Underlying, Derivative Mass | $ / £ | 0.98 | 0.97
Zinc 2025 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 41,061 | 59,194
Underlying, Derivative Mass | $ / £ | 1.4 | 1.39
Zinc 2026 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 16,755 | 6,283
Underlying, Derivative Mass | $ / £ | 1.36 | 1.41
Lead 2025 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 33,069 | 47,840
Underlying, Derivative Mass | $ / £ | 0.99 | 0.99
Lead 2026 Settlements For Forecasted Sale |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 52,911 | 52,911
Underlying, Derivative Mass | $ / £ | 1.03 | 1.03

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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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