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Note 7 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Pension Plan [Member]        
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year   $ 0.2    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement $ 11.8      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 1.8      
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year   0.3    
Defined Benefit Plan, Plan Assets, Contributions by Employer   1.1 $ 1.2  
Defined Benefit Plan, Benefit Obligation   $ 17.0   $ 17.3