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Note 9 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 CAD ($) Contract | Dec. 31, 2022 USD ($) 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 | $ 800 |  |  |
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 |  |  |  | $ 8,400
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent |  |
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 |  |  |  | 3,700
Realize gain on derivative | $ 17,400 |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Unrealized Gain (Loss) on Derivatives | (100) |  |  |
Price Risk Derivative [Member] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  | 16,800
Foreign Exchange Forward [Member] |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  | 7,100
Foreign Exchange Forward [Member] | Casa Berardi [Member] |  |  |  |
Derivative, Notional Amount |  |  | $ 427.4 | $ 325,100
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |  |
Derivative, Forward Exchange Rate |  |  | 1.26 | 1.26
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |  |
Derivative, Forward Exchange Rate |  |  | 1.3765 | 1.3765
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Number of Instruments Held, Total | Contract |  |  | 278 | 278
Derivative, Notional Amount |  |  | $ 499.0 | $ 377,400
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |
Derivative, Forward Exchange Rate |  |  | 1.26 | 1.26
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |
Derivative, Forward Exchange Rate |  |  | 1.37920 | 1.37920
Unsettled Concentrate Sales Contracts [Member] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 5,800 |  |  |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 6,000 |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | $ (32,900) |  |
Commodity Contract [Member] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total |  |  |  | $ 22,200
Derivative, Fair Value, Obligations Under the Agreements |  |  |  | $ 22,200

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