Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 29, 2020	Aug. 24, 2019	Aug. 29, 2020	Aug. 24, 2019
Income Statement [Abstract]
NET SALES	$ 4,926	$ 7,252	$ 16,760	$ 17,966
COST AND EXPENSES:
Cost of goods sold	(3,115)	(4,042)	(9,982)	(10,138)
Research and development	(306)	(428)	(1,192)	(1,260)
Selling, general & administrative expenses	(1,342)	(1,440)	(4,076)	(4,045)
Total cost and expenses	(4,763)	(5,910)	(15,250)	(15,443)
OPERATING INCOME	163	1,342	1,510	2,523
Other income, net	1	39	27	87
INCOME BEFORE TAXES	164	1,381	1,537	2,610
Provision for taxes	35	193	227	365
NET INCOME	$ 129	$ 1,188	$ 1,310	$ 2,245
NET INCOME PER SHARE, BASIC AND DILUTED	$ 0.05	$ 0.46	$ 0.51	$ 0.87
DIVIDENDS PER SHARE			$ 0.10	$ 0.10
WEIGHTED AVERAGE OF SHARES, basic and diluted	2,578,315	2,578,315	2,578,315	2,578,315