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Note 15 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Service cost $ 5 $ 4
Interest cost on projected benefit obligation 1,084 1,407
Net amortization of actuarial loss 631 666
Expected return on plan assets (987) (1,103)
Net periodic benefit cost $ 733 $ 974