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Note 7 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Pension Plan [Member]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 900 $ 0  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 100    
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 900 $ 1,100  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 300    
Defined Benefit Plan, Benefit Obligation $ 14,300   $ 16,300