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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Service cost $ 0 $ 88 $ 0 $ 176
Interest cost 83 79 166 158
Amortization of prior service cost 0 30 0 61
Amortization of losses 33 66 67 132
Net periodic cost $ 116 $ 263 $ 233 $ 527