Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2020	Feb. 23, 2019
Income Statement [Abstract]
NET SALES	$ 5,957	$ 3,805
COST AND EXPENSES:
Cost of goods sold	(3,325)	(2,347)
Research and development	(478)	(390)
Selling, general & administrative expenses	(1,376)	(1,317)
Total cost and expenses	(5,179)	(4,054)
OPERATING INCOME (LOSS)	778	(249)
Other income, net	26	23
INCOME (LOSS) BEFORE TAXES	804	(226)
(Provision) benefit for taxes	(112)	32
NET INCOME (LOSS)	$ 692	$ (194)
NET INCOME (LOSS) PER SHARE, BASIC AND DILUTED	$ 0.27	$ (0.08)
DIVIDENDS PER SHARE	$ 0.10	$ 0.10
WEIGHTED AVERAGE OF SHARES, basic and diluted	2,578,315	2,578,315