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Note 4 - Periodic Pension Cost - Net Periodic Benefit Cost (Details) - Supplemental Employee Retirement Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Service cost on benefits earned during the period $ 0 $ 51 $ 21 $ 102
Interest cost on projected benefit obligation 159 100 318 200
Recognized actuarial loss 55 428 110 856
Net periodic pension cost $ 214 $ 579 $ 449 $ 1,158