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Note 8 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) Contract | Mar. 31, 2023 USD ($) | Mar. 31, 2024 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 | $ 400 | $ 900 |
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 | 11,200 |  |
Other Comprehensive Income (Loss) [Member] |  |  |
Derivative [Line Items] |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 2,900 |  |
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 3,900 |  |
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 35,100 |  |
Derivative, Forward Exchange Rate | 0.01351 |  | 0.01351
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Forward Exchange Rate | 0.01278 |  | 0.01278
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Forward Exchange Rate | 0.013665 |  | 0.013665
Foreign Exchange Forward [Member] | Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 19.2
Derivative, Forward Exchange Rate | 0.000001354 |  | 0.000001354
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | $ 299.7
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Number of Instruments Held, Total | Contract | 493 |  | 493
Derivative, Notional Amount |  |  | $ 370.6
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi and Keno Hill [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 278,600 |  |
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 1,900 | 700 |
Price Risk Derivative [Member] |  |  |
Derivative [Line Items] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 12,500 |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 3,100 | 900 |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 1,900 | 3,000 |
Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total | 5,400 |  |
Derivative, Fair Value, Obligations Under the Agreements | 5,400 |  |
Zinc Contract 2022 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 17,400 | $ 8,500 |

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