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v3.23.3

Note 8 - Derivative Instruments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) Contract | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) Contract | Sep. 30, 2022 USD ($)
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 | $ 600 |  | $ 2,500 |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness |  |  | 0 |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | 11,700 |  | 11,700 |
Other Comprehensive Income (Loss) [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 2,900 |  | 2,900 |
Derivative, Gain (Loss) on Derivative, Net, Total | 17,400 |  | 7,600 |
Foreign Exchange Forward [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 4,900 |  | 4,900 |
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 52,600 |  | $ 52,600 |
Derivative, Forward Exchange Rate | 0.000001357 |  | 0.000001357 |
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Forward Exchange Rate | 1,275.5000 |  | 1,275.5000 |
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Forward Exchange Rate | 13,725 |  | 13,725 |
Foreign Exchange Forward [Member] | Keno Hill [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 27,100 |  | $ 27,100 |
Derivative, Forward Exchange Rate | 0.0000013533 |  | 0.0000013533 |
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 406,300 |  | $ 406,300 |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Number of Instruments Held, Total | Contract | 642 |  | 642 |
Derivative, Notional Amount | $ 510,800 |  | $ 510,800 |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi and Keno Hill [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 383,600 |  | 383,600 |
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Derivatives | 3,200 |  | 100 |
Price Risk Derivative [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | 15,100 |  | 15,100 |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | $ 4,000 | 13,100 |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  | 6,700 | 13,000 |
Forecasted Future Concentrate Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 1,600 | $ 1,600 | 8,100 | $ 8,100
Commodity Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total | 7,100 |  | 7,100 |
Derivative, Fair Value, Obligations Under the Agreements | $ 7,100 |  | $ 7,100 |

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