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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 90 83 267 249
Amortization of prior service cost 0 0 0 0
Amortization of losses 32 34 95 101
Net periodic cost $ 122 $ 117 $ 362 $ 350