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Note 15 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Service cost $ 4 $ 4
Interest cost on projected benefit obligation 1,407 1,315
Net amortization of actuarial loss 666 632
Expected return on plan assets (1,103) (1,363)
Net periodic benefit cost $ 974 $ 588