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Note 16 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Service cost $ 4 $ 6
Interest cost 1,315 1,518
Net amortization of actuarial loss 632 693
Expected return on plan assets (1,363) (1,813)
Net periodic benefit cost $ 588 $ 404