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

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Nominal or face amount used to calculate payment on derivative.

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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