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Note 8 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) - Supplemental Employee Retirement Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Service cost $ 97 $ 316 $ 111 $ 328
Interest cost 239 1,006 2,737 2,853
Expected return on plan assets (114) (711) (2,208) (1,787)
Administrative expenses 52 83 64 90
Settlement loss 79 (46) 910 46
Amortization of net actuarial losses 5 0 (4) 0
Net periodic pension cost $ 358 $ 648 $ 1,610 $ 1,530