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Note 8 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) - Pension Plan And Supplemental Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Interest cost $ 653 $ 579 $ 1,499 $ 1,157
Expected return on plan assets (365) (751) (1,053) (1,503)
Amortization of net actuarial (gains) losses (4) 16 (70) 32
Net periodic pension (benefit) cost $ 284 $ (156) $ 376 $ (314)