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Note 10 - 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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Service cost $ 61 $ 57 $ 184 $ 173
Interest cost 90 93 269 279
Amortization of prior service cost 57 57 171 171
Amortization of losses 15 8 43 23
Net periodic cost $ 223 $ 215 $ 667 $ 646