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Note 8 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2022 CAD ($)
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 | $ 1,100 |  |
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 | (28,000) |  |
Other Comprehensive Income (Loss) [Member] |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 3,700 |  |
Foreign Exchange Forward [Member] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | $ 7,800 |  |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |
Derivative, Number of Instruments Held, Total | 146 |  | 146
Derivative, Notional Amount | $ 213,300 |  | $ 276.7
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |
Derivative, Forward Exchange Rate | 1.2702 |  | 1.2702
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |
Derivative, Forward Exchange Rate | 1.3333 |  | 1.3333
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Unrealized Gain (Loss) on Derivatives | $ 400 |  |
Price Risk Derivative [Member] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (63,000) |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (4,800) | $ 2,800 |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | (300) |  |
Forecasted Future Concentrate Contracts [Member] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (600) | $ 500 |
Commodity Contract [Member] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total | 83,200 |  |
Derivative, Fair Value, Obligations Under the Agreements | $ 83,200 |  |

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