v3.26.1
Note 3 - Business Segments and Sales of Products (Details Textual)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Segment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting [Line Items]          
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax   Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent
Derivative, loss on derivative $ 10.2 $ 5.1 $ 29.6 $ 1.3 $ 19.7
Number of reportable segments | Segment 3   3    
Keno Hill [Member]          
Segment Reporting [Line Items]          
Revenues $ 1.7 $ 1.0