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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		9 Months Ended
	Sep. 20, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Service cost	$ 0	$ 97	$ 0	$ 111
Interest cost	542	239	1,628	2,737
Expected return on plan assets	(543)	(114)	(1,630)	(2,208)
Administrative expenses	0	52	0	64
Settlement loss	0	79	0	910
Amortization of net actuarial losses	36	5	109	(4)
Net periodic pension cost	$ 35	$ 358	$ 107	$ 1,610

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