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Note 9 - Components of Net Periodic Pension Cost - Net Periodic Pension Cost (Details) - Pension Plan [Member] - 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 110 78 330 233
Expected return on plan assets (209) (237) (628) (711)
Net amortization 74 17 222 49
Total periodic pension income $ (25) $ (142) $ (76) $ (429)