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Note 4 - Long-Term Debt (Details Textual) - USD ($)
$ in Millions
Jan. 20, 2023
Mar. 31, 2024
Feb. 09, 2024
Dec. 31, 2023
Jul. 24, 2023
Jul. 05, 2022
Line of Credit Facility, Maximum Borrowing Capacity           $ 300
Line of Credit Facility, Secured Borrowing Base           $ 75
Maximum [Member]            
Line of Credit Facility, Increase (Decrease), Net $ 75          
Minimum [Member]            
Line of Credit Facility, Increase (Decrease), Net $ 60          
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 65 $ 65  
Long-Term Line of Credit       11    
Line of Credit Facility, Remaining Borrowing Capacity       $ 64    
Revolving Credit Facility [Member] | Subsequent Event [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 85      
Long-Term Line of Credit   $ 4        
Line of Credit Facility, Remaining Borrowing Capacity   $ 81