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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Service cost $ 88 $ 78 $ 176 $ 155
Interest cost 79 89 158 178
Amortization of prior service cost 30 50 61 100
Amortization of losses 66 47 132 93
Net periodic cost $ 263 $ 264 $ 527 $ 526