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Note 12 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Service cost $ 78 $ 80 $ 155 $ 160
Interest cost 89 101 178 202
Amortization of prior service cost 50 64 100 128
Amortization of losses 47 6 93 11
Net periodic cost $ 264 $ 251 $ 526 $ 501