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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 95 83 177 166
Amortization of prior service cost 0 0 0 0
Amortization of losses 31 33 63 67
Net periodic cost $ 126 $ 116 $ 240 $ 233