Note 10 - Derivative Instruments (Details Textual) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 CAD ($) Contract	Dec. 31, 2025 USD ($) 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	$ (4.1)	$ (3.8)	$ (3.6)
Unrealized Gain (Loss) on Derivatives	10.4
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months					$ 1.1
Premium paid					25.0
Price Risk Derivative [Member]
Derivative [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax					$ 0.2
Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 1.3
Derivative, Forward Exchange Rate				0.01354	0.01354
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax					$ 0.9
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months					$ 0.9
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	4.8	(5.7)	1.2
Foreign Exchange Forward [Member] | Casa Berardi [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate				0.01336	0.01336
Exchange Rate				0.01323	0.01323
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate				0.013148	0.013148
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, Forward Exchange Rate				0.014202	0.014202
Foreign Exchange Forward [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held, Total | Contract				216	216
Derivative, Notional Amount				$ 140.8	$ 103.1
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 3.5
Derivative, Forward Exchange Rate				0.01383	0.01383
Cash Operating Expenditure				$ 35.7
Foreign Exchange Forward [Member] | Casa Berardi & Keno Hill [Member]
Derivative [Line Items]
Derivative, Notional Amount				3.3
Foreign Exchange Forward [Member] | Keno Hill [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 37.5
Derivative, Forward Exchange Rate				0.0139	0.0139
Cash Operating Expenditure				$ 59.5
Exchange Rate				0.01377	0.01377
Unsettled Concentrate Sales Contracts [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	(12.0)	1.3	$ 19.7
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	13.1	$ 11.4
Settlement Under Collars [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	$ 51.5
Commodity Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total					$ 43.6
Derivative, Fair Value, Obligations Under the Agreements					$ 43.6