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Note 10 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 CAD ($) Contract | Dec. 31, 2024 USD ($) Contract
Maximum Allocation of Forecasted CAD-demonimated Operating Costs |  |  |  | 75.00% | 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year) | 5 years |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 3,800 | $ 3,600 | $ 800 |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness | 0 | 0 | $ 0 |  |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months |  |  |  |  | $ 7,900
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months |  |  |  |  | 6,000
Price Risk Derivative [Member] |  |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  |  | $ 13,400
Foreign Exchange Forward [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 11.7 |
Derivative, Forward Exchange Rate |  |  |  | 0.01368 | 0.01368
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  |  | $ 8,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | 5,700 | 1,200 | $ 100 |  |
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 15.8 |
Derivative, Forward Exchange Rate |  |  |  | 0.01345 | 0.01345
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |  |  |
Derivative, Forward Exchange Rate |  |  |  | 0.012816 | 0.012816
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |  |  |
Derivative, Forward Exchange Rate |  |  |  | 0.014223 | 0.014223
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative, Number of Instruments Held, Total | Contract |  |  |  | 378 | 378
Derivative, Notional Amount |  |  |  | $ 279.3 | $ 206,600
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 198.6 |
Derivative, Forward Exchange Rate |  |  |  | 0.0134 | 0.0134
Foreign Exchange Forward [Member] | Casa Berardi & Keno Hill [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 5.6 |
Derivative, Forward Exchange Rate |  |  |  | 0.014025 | 0.014025
Foreign Exchange Forward [Member] | Keno Hill [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 47.7 |
Derivative, Forward Exchange Rate |  |  |  | 0.01373 | 0.01373
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 1,300 | $ 19,700 | $ 5,800 |  |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 11,400 |  |  |  |
Zinc Contract 2022 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 8,500 |  |  |  |
Commodity Contract [Member] |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total |  |  |  |  | $ 10,200
Derivative, Fair Value, Obligations Under the Agreements |  |  |  |  | $ 10,200
Zinc and Lead Contract 2023 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 17,400 |  |  |  |

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