v3.26.1
Note 9 - Derivative Instruments (Details Textual)
oz in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Contract
oz
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Contract
oz
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2026
CAD ($)
Contract
Dec. 31, 2025
CAD ($)
Contract
Derivative [Line Items]              
Maximum Allocation of Forecasted CAD-demonimated Operating Costs 75.00%   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 when revenue is recognized from a shipment of concentrate until final settlement.            
Realized Investment Gains     $ 51,900,000        
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year) 5 years   5 years        
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net     $ (4,100,000) $ (3,800,000) $ (3,600,000)    
Unrealized Gain (Loss) on Derivatives $ 1,200   10,400,000        
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months $ 3,400,000   $ 1,100,000        
Production Protected | oz 10,000   9,672        
Assets Needed for Immediate Settlement, Aggregate Fair Value $ 50   $ 50        
Maximum [Member]              
Derivative [Line Items]              
General FairValue Hedge Information Minimum R Square 100.00%         100.00%  
Casa Berardi [Member]              
Derivative [Line Items]              
Other Adjustments To Income Discontinued Operations   $ 1,800,000          
Realized Investment Gains $ 900,000            
Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Derivative, Notional Amount           $ 0.9 $ 1.3
Derivative, Forward Exchange Rate 0.013528   0.01354     0.013528 0.01354
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax     $ 900,000        
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months     $ 900,000        
Derivative, Gain (Loss) on Derivative, Net, Total $ 300,000 0          
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] | Keno Hill [Member]              
Derivative [Line Items]              
Derivative, Notional Amount           $ 30.2 $ 37.5
Cash Operating Expenditure           $ 42.9 $ 59.5
Derivative, Forward Exchange Rate 0.013948   0.0139     0.013948 0.0139
Exchange Rate 0.013797   0.01377     0.013797 0.01377
Foreign Exchange Forward [Member] | Casa Berardi and Keno Hill [Member]              
Derivative [Line Items]              
Derivative, Forward Exchange Rate     0.01383       0.01383
Foreign Exchange Forward [Member] | Casa Berardi & Keno Hill [Member]              
Derivative [Line Items]              
Derivative, Notional Amount           $ 2.7 $ 3.3
Derivative, Forward Exchange Rate 0.013845         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   165     132 165
Derivative, Notional Amount $ 55,300,000   $ 73,100,000     $ 76.6 $ 101.6
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]              
Derivative [Line Items]              
Unrealized Gain (Loss) on Derivatives     4,800,000 (5,700,000) 1,200,000    
Price Risk Derivative [Member]              
Derivative [Line Items]              
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax 3,700,000   200,000        
Settlement Under Collars [Member]              
Derivative [Line Items]              
Derivative, Gain (Loss) on Derivative, Net, Total 22,300,000 600,000 51,500,000        
Unsettled Concentrate Sales Contracts [Member]              
Derivative [Line Items]              
Derivative, Gain (Loss) on Derivative, Net, Total 10,200,000 5,300,000 (12,000,000) 1,300,000 $ 19,700,000    
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 2,300,000 $ 2,200,000 13,100,000 $ 11,400,000      
Commodity Contract [Member]              
Derivative [Line Items]              
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total 10,500,000   43,600,000        
Derivative, Fair Value, Obligations Under the Agreements $ 10,500,000   $ 43,600,000