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 Reporting, Revenue Reconciling Item [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    
Derivative, Loss on Derivative $ 10.2   $ 5.1
Number of Reportable Segments | Segment 3    
Keno Hill [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues $ 1.7 $ 1.0