v3.26.1
Note 11 - Derivative Instruments (Details Textual)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2026
CAD ($)
Contract
Mar. 31, 2026
USD ($)
Contract
Dec. 31, 2025
CAD ($)
Contract
Dec. 31, 2025
USD ($)
Contract
Derivative [Line Items]                  
Maximum Allocation of Forecasted CAD-demonimated Operating Costs           75.00% 75.00% 75.00% 75.00%
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
Premium paid                 25,000,000
Price Risk Derivative [Member]                  
Derivative [Line Items]                  
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax             $ 3,700,000   $ 200,000
Foreign Exchange Forward [Member]                  
Derivative [Line Items]                  
Derivative, Notional Amount           $ 0.9   $ 1.3  
Derivative, Forward Exchange Rate           0.013528 0.013528 0.01354 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] | Not Designated as Hedging Instrument [Member]                  
Derivative [Line Items]                  
Unrealized Gain (Loss) on Derivatives     4,800,000 (5,700,000) 1,200,000        
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           132 132 165 165
Derivative, Notional Amount           $ 76.6 $ 55,300,000 $ 101.6 $ 73,100,000
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] | Keno Hill [Member]                  
Derivative [Line Items]                  
Derivative, Notional Amount           $ 30.2   $ 37.5  
Derivative, Forward Exchange Rate           0.013948 0.013948 0.0139 0.0139
Cash Operating Expenditure           $ 42.9   $ 59.5  
Exchange Rate           0.013797 0.013797 0.01377 0.01377
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          
Settlement Under Collars [Member]                  
Derivative [Line Items]                  
Derivative, Gain (Loss) on Derivative, Net, Total $ 22,300,000 $ 600,000 $ 51,500,000            
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