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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Service cost $ 80 $ 61 $ 240 $ 184
Interest cost 101 90 303 269
Amortization of prior service cost 65 57 193 171
Amortization of losses 5 15 16 43
Net periodic cost $ 251 $ 223 $ 752 $ 667