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Note 7 - Employee Benefit Plans - Defined Benefit Pension Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Interest cost $ 665 $ 371
Expected return on plan assets (788) (818)
Net amortization loss 328 27
Net periodic benefit expense (credit) $ 210 $ (420)