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Note 13 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (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 $ 92 $ 126 $ 185 $ 251
Interest cost 221 159 443 318
Net amortization 18 78 35 156
Net periodic benefit cost $ 331 $ 363 $ 663 $ 725