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Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Contractual rate at which a foreign currency can be purchased or sold.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Note 8 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) Contract	Mar. 31, 2022 USD ($)	Mar. 31, 2023 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	$ 900
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	15,200
Other Comprehensive Income (Loss) [Member]
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	3,300
Derivative, Gain (Loss) on Derivative, Net, Total	17,400
Foreign Exchange Forward [Member]
Derivative [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	$ 6,100
Foreign Exchange Forward [Member] \| Casa Berardi [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 393.9
Foreign Exchange Forward [Member] \| Casa Berardi [Member] \| Minimum [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	0.001272		0.001272
Foreign Exchange Forward [Member] \| Casa Berardi [Member] \| Maximum [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate	0.00013757		0.00013757
Foreign Exchange Forward [Member] \| Designated as Hedging Instrument [Member] \| Casa Berardi [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held, Total \| Contract	569		569
Derivative, Notional Amount	$ 454,700		$ 604.8
Foreign Exchange Forward [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	700
Price Risk Derivative [Member]
Derivative [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	24,800
Unsettled Concentrate Sales Contracts [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	900
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	3,000
Forecasted Future Concentrate Contracts [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	4,800	$ 4,800
Commodity Contract [Member]
Derivative [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total	14,000
Derivative, Fair Value, Obligations Under the Agreements	$ 14,000