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Note 8 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash     $ (1,807) $ 0  
Pension Plan [Member]          
Defined Benefit Plan, Benefit Obligation, Payment for Settlement   $ 11,800      
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash $ (1,800)        
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan, Plan Assets, Contributions by Employer     1,200 $ 1,200  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year     400    
Defined Benefit Plan, Benefit Obligation     $ 17,000   $ 17,300