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Note 10 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 CAD ($) Contract	Dec. 31, 2024 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	$ 3,800	$ 3,600	$ 800
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness	0	0	$ 0
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months					$ 7,900
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					6,000
Price Risk Derivative [Member]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax					$ 13,400
Foreign Exchange Forward [Member]
Derivative, Notional Amount				$ 11.7
Derivative, Forward Exchange Rate				0.01368	0.01368
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax					$ 8,000
Foreign Exchange Forward [Member] \| Not Designated as Hedging Instrument [Member]
Unrealized Gain (Loss) on Derivatives	5,700	1,200	$ 100
Foreign Exchange Forward [Member] \| Casa Berardi [Member]
Derivative, Notional Amount				$ 15.8
Derivative, Forward Exchange Rate				0.01345	0.01345
Foreign Exchange Forward [Member] \| Casa Berardi [Member] \| Minimum [Member]
Derivative, Forward Exchange Rate				0.012816	0.012816
Foreign Exchange Forward [Member] \| Casa Berardi [Member] \| Maximum [Member]
Derivative, Forward Exchange Rate				0.014223	0.014223
Foreign Exchange Forward [Member] \| Casa Berardi [Member] \| Designated as Hedging Instrument [Member]
Derivative, Number of Instruments Held, Total \| Contract				378	378
Derivative, Notional Amount				$ 279.3	$ 206,600
Foreign Exchange Forward [Member] \| Casa Berardi and Keno Hill [Member]
Derivative, Notional Amount				$ 198.6
Derivative, Forward Exchange Rate				0.0134	0.0134
Foreign Exchange Forward [Member] \| Casa Berardi & Keno Hill [Member]
Derivative, Notional Amount				$ 5.6
Derivative, Forward Exchange Rate				0.014025	0.014025
Foreign Exchange Forward [Member] \| Keno Hill [Member]
Derivative, Notional Amount				$ 47.7
Derivative, Forward Exchange Rate				0.01373	0.01373
Unsettled Concentrate Sales Contracts [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	1,300	$ 19,700	$ 5,800
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	11,400
Zinc Contract 2022 [Member] \| Other Comprehensive Income (Loss) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	8,500
Commodity Contract [Member]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total					$ 10,200
Derivative, Fair Value, Obligations Under the Agreements					$ 10,200
Zinc and Lead Contract 2023 [Member] \| Other Comprehensive Income (Loss) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ 17,400