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Note 10 - Benefit Plans - Pension Plans With Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Projected benefit obligation   $ 15,523
Fair value of plan assets   0
Underfunded (Overfunded)   15,523
Pension Plan [Member]    
Projected benefit obligation $ 12,993 15,654
Fair value of plan assets 0 (546)
Underfunded (Overfunded) $ 12,993 15,108
Supplemental Employee Retirement Plan [Member]    
Projected benefit obligation   131
Fair value of plan assets   (546)
Underfunded (Overfunded)   $ (415)