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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. 20, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Service cost $ 0 $ (26) $ 0 $ 14
Interest cost 543 2,273 1,086 2,498
Expected return on plan assets (544) (2,058) (1,087) (2,094)
Administrative expenses 0 (11) 0 12
Settlement loss 0 323 0 831
Amortization of net actuarial losses 37 35 73 (9)
Net periodic pension cost $ 36 $ 536 $ 72 $ 1,252