v3.26.1
Note 8 - Derivative Instruments (Details Textual)
oz in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Contract
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Contract
oz
Jun. 30, 2025
USD ($)
Jun. 30, 2026
CAD ($)
Contract
Derivative [Line Items]          
Maximum Allocation of Forecasted CAD-demonimated Operating Costs 75.00%   75.00%   75.00%
Description of hedge activity     Within this period we can hedge up to 100% of a specific exposure, provided the derivative allows us to participate 100% in the upside. Our program also utilizes derivatives to manage price risk exposure created from the date when revenue is recognized from a shipment of concentrate until final settlement.    
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year)     5 years    
Unrealized Gain (Loss) on Derivatives $ 6,400,000   $ 7,600,000    
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months 12,300,000   12,300,000    
Derivative, Gain (Loss) on Derivative, Net, Total 9,900,000 $ 3,300,000 $ (300,000) $ (2,000,000)  
Derivative instrument gold put option purchased | oz     6,767    
Assets Needed for Immediate Settlement, Aggregate Fair Value $ 50   $ 50    
Maximum [Member]          
Derivative [Line Items]          
Derivative instruments, hedging exposure 100.00%   100.00%   100.00%
Casa Berardi [Member]          
Derivative [Line Items]          
Other Adjustments To Income Discontinued Operations   1,000,000   2,800,000  
Realized losses     $ 900,000    
Foreign Exchange Forward [Member]          
Derivative [Line Items]          
Derivative, Notional Amount $ 3,300,000   $ 3,300,000    
Derivative, Forward Exchange Rate 0.013817   0.013817   0.013817
Derivative, Gain (Loss) on Derivative, Net, Total $ 3,600,000 5,400,000 $ 3,300,000 5,500,000  
Foreign Exchange Forward [Member] | Keno Hill [Member]          
Derivative [Line Items]          
Derivative, Notional Amount         $ 29.8
Cash Operating Expenditure $ 51,300,000   $ 51,300,000    
Derivative, Forward Exchange Rate 0.013857   0.013857   0.013857
Exchange Rate 0.013814   0.013814   0.013814
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member]          
Derivative [Line Items]          
Derivative, Notional Amount $ 7,300,000   $ 7,300,000    
Derivative, Forward Exchange Rate 0.01388   0.01388   0.01388
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member]          
Derivative [Line Items]          
Derivative, Number of Instruments Held, Total | Contract 135   135   135
Derivative, Notional Amount $ 66,300,000   $ 66,300,000   $ 91.8
Price Risk Derivative [Member]          
Derivative [Line Items]          
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax 14,900,000   14,900,000    
Settlement Under Collars [Member]          
Derivative [Line Items]          
Derivative, Gain (Loss) on Derivative, Net, Total 12,600,000 800,000 9,700,000 200,000  
Unsettled Concentrate Sales Contracts [Member]          
Derivative [Line Items]          
Derivative, Gain (Loss) on Derivative, Net, Total 9,900,000 3,300,000 300,000 2,000,000  
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 700,000 $ 3,000,000 1,600,000 $ 5,700,000  
Commodity Contract [Member]          
Derivative [Line Items]          
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total 21,500,000   21,500,000    
Derivative, Fair Value, Obligations Under the Agreements $ 21,500,000   $ 21,500,000