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Note 8 - Derivative Instruments (Details Textual) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) Contract oz $ / oz | Mar. 31, 2024 USD ($) | Mar. 31, 2025 CAD ($) Contract
Derivative [Line Items] |  |  |
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 | $ 1,800,000 | $ 400,000 |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness | 0 | 0 |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | 12,100,000 |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 5,100,000 | 3,100,000 |
Put Option |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 600,000 |  |
Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Price per ounce | $ / oz | 31.4 |  |
Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Price per ounce | $ / oz | 33.97 |  |
Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative instrument gold put option purchased | oz | 590,000 |  |
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 7.8
Derivative, Forward Exchange Rate | 0.013732 |  | 0.013732
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | $ 6,500,000 |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ 5,000,000 |  |
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 12.6
Derivative, Forward Exchange Rate | 0.013432 |  | 0.013432
Foreign Exchange Forward [Member] | Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 53.4
Derivative, Forward Exchange Rate | 0.013985 |  | 0.013985
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 166.4
Derivative, Forward Exchange Rate | 0.01346 |  | 0.01346
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 5.4
Derivative, Forward Exchange Rate | 0.014054 |  | 0.014054
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Number of Instruments Held, Total | Contract | 328 |  | 328
Derivative, Notional Amount | $ 208,300,000 |  | $ 285.6
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 100,000 | 1,900,000 |
Price Risk Derivative [Member] |  |  |
Derivative [Line Items] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 5,200,000 |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 33.97 |  |
Price per ounce | $ / oz | 31.4 |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ (5,300,000) | 3,100,000 |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 2,200,000 | $ 1,900,000 |
Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total | 10,500,000 |  |
Derivative, Fair Value, Obligations Under the Agreements | 10,500,000 |  |
Zinc Contract 2022 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 17,400,000 |  |
Zinc and Lead Contract 2023 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 8,500,000 |  |

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