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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
	Mar. 21, 2021	Mar. 31, 2020
Service cost	$ 0	$ 40
Interest cost	543	225
Expected return on plan assets	(543)	(36)
Administrative expenses	0	23
Settlement loss	0	508
Amortization of net actuarial losses	36	(44)
Net periodic pension cost	$ 36	$ 716

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