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Note 11 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Service cost $ 80 $ 68
Interest cost 101 89
Amortization of prior service cost 64 59
Amortization of losses 5 12
Net periodic cost $ 250 $ 228