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Note 8 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Contract | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Contract oz | Sep. 30, 2024 USD ($) | Sep. 30, 2025 CAD ($) Contract
Derivative [Line Items] |  |  |  |  |
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 75.00% |  | 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 | $ 700 | $ 1,500 | $ 3,500 | $ 3,000 |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | 8,600 |  | 8,600 |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 8,500 | 600 | 9,800 | 8,800 |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ 100 |  |
Casa Berardi [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative instrument gold put option purchased | oz |  |  | 4,000 |  |
Casa Berardi [Member] | Minimum [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Assets Needed for Immediate Settlement, Aggregate Fair Value | 3,000 |  | $ 3,000 |  |
Casa Berardi [Member] | Maximum [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Assets Needed for Immediate Settlement, Aggregate Fair Value | $ 4,840 |  | $ 4,840 |  |
Foreign Exchange Forward [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 2.5
Derivative, Forward Exchange Rate | 0.013657 |  | 0.013657 |  | 0.013657
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | $ 1,800 |  | $ 1,800 |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ 1,600 |  | $ 1,600 |  |
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 6.5
Cash Operating Expenditure |  |  |  |  | $ 53.2
Derivative, Forward Exchange Rate | 0.013399 |  | 0.013399 |  | 0.013399
Exchange Rate | 0.013248 |  | 0.013248 |  | 0.013248
Foreign Exchange Forward [Member] | Keno Hill [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 35.8
Cash Operating Expenditure |  |  |  |  | $ 65.5
Derivative, Forward Exchange Rate | 0.013934 |  | 0.013934 |  | 0.013934
Exchange Rate | 0.013821 |  | 0.013821 |  | 0.013821
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 4.2
Derivative, Forward Exchange Rate | 0.01392 |  | 0.01392 |  | 0.01392
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Number of Instruments Held, Total | Contract | 246 |  | 246 |  | 246
Derivative, Notional Amount | $ 122,900 |  | $ 122,900 |  | $ 167.7
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | 2,000 | 500 | 3,500 | 1,900 |
Price Risk Derivative [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 8,900 |  | 8,900 |  |
Settlement Under Collars [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 6,300 |  | 6,500 |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 14,000 | 600 | 16,000 | 8,800 |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 5,100 | $ 2,100 | 10,800 | $ 7,100 |
Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total | 13,800 |  | 13,800 |  |
Derivative, Fair Value, Obligations Under the Agreements | $ 13,800 |  | 13,800 |  |
Zinc Contract 2022 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | 17,400 |  |
Zinc and Lead Contract 2023 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ 8,500 |  |

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