Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Net income (loss)	$ 3,016	$ 2,178	$ 13,001	$ (16,964)
Other comprehensive income:
Other comprehensive income, net of tax	35	25	104	74
Total comprehensive income (loss)	3,051	2,203	13,105	(16,890)
Pension Plan [Member]
Other comprehensive income:
Amortization associated with awards	36	31	108	94
Income taxes related to Retirement Plan	(9)	(8)	(28)	(24)
Supplemental Employee Retirement Plan [Member]
Other comprehensive income:
Amortization associated with awards	11	2	33	5
Income taxes related to Retirement Plan	$ (3)	$ 0	$ (9)	$ (1)