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Period within which forecasted CAD (Canadian dollar) denominated operating costs will be hedged.

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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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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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, 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