v3.26.1
Note 9 - Derivative Instruments (Details Textual)
oz in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
Contract
oz
Mar. 31, 2025
USD ($)
Mar. 31, 2026
CAD ($)
Contract
Sep. 30, 2025
Derivative [Line Items]        
Maximum Allocation of Forecasted CAD-demonimated Operating Costs 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 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 $ 1,200      
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months $ 3,400,000      
Derivative instrument gold put option purchased | oz 10,000      
Assets Needed for Immediate Settlement, Aggregate Fair Value $ 50      
Maximum [Member]        
Derivative [Line Items]        
Derivative instruments, hedging exposure 100.00%   100.00%  
Casa Berardi [Member]        
Derivative [Line Items]        
Other Adjustments To Income Discontinued Operations   $ 1,800,000    
Realized losses $ 900,000      
Foreign Exchange Forward [Member]        
Derivative [Line Items]        
Derivative, Notional Amount 900,000      
Derivative, Forward Exchange Rate       0.013528
Derivative, Gain (Loss) on Derivative, Net, Total 300,000 0    
Foreign Exchange Forward [Member] | Keno Hill [Member]        
Derivative [Line Items]        
Derivative, Notional Amount     $ 30.2  
Cash Operating Expenditure $ 42,900,000      
Derivative, Forward Exchange Rate 0.013948   0.013948  
Exchange Rate 0.013797   0.013797  
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member]        
Derivative [Line Items]        
Derivative, Notional Amount $ 2,700,000      
Derivative, Forward Exchange Rate       0.013845
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member]        
Derivative [Line Items]        
Derivative, Number of Instruments Held, Total | Contract 132   132  
Derivative, Notional Amount $ 55,300,000   $ 76.6  
Price Risk Derivative [Member]        
Derivative [Line Items]        
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax 3,700,000      
Settlement Under Collars [Member]        
Derivative [Line Items]        
Derivative, Gain (Loss) on Derivative, Net, Total 22,300,000 600,000    
Unsettled Concentrate Sales Contracts [Member]        
Derivative [Line Items]        
Derivative, Gain (Loss) on Derivative, Net, Total 10,200,000 5,300,000    
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 2,300,000 $ 2,200,000    
Commodity Contract [Member]        
Derivative [Line Items]        
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total 10,500,000      
Derivative, Fair Value, Obligations Under the Agreements $ 10,500,000