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Note 9 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) - Pension Plan And Supplemental Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Interest cost $ 578 $ 543 $ 1,735 $ 1,086
Expected return on plan assets (751) (544) (2,254) (1,087)
Amortization of net actuarial losses 15 37 47 73
Net periodic pension cost (benefit) $ (158) $ 36 $ (472) $ 72