CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 25, 2018	Aug. 26, 2017	Aug. 25, 2018	Aug. 26, 2017
Income Statement [Abstract]
NET SALES	$ 5,002	$ 4,717	$ 13,842	$ 13,591
COST AND EXPENSES:
Cost of goods sold	(3,272)	(2,952)	(8,611)	(8,526)
Research and development	(314)	(413)	(963)	(1,305)
Selling, general & administrative expenses	(1,303)	(1,034)	(3,750)	(3,006)
Total cost and expenses	(4,899)	(4,399)	(13,324)	(12,837)
OPERATING INCOME	113	318	518	754
Other income	21	19	25	23
Interest income, net	17	8	47	10
INCOME BEFORE TAXES	151	345	590	787
Benefit (provision) for taxes	113	32	163	(109)
NET INCOME	$ 264	$ 377	$ 753	$ 678
NET (LOSS) INCOME PER SHARE, BASIC AND DILUTED	$ 0.10	$ 0.15	$ 0.29	$ 0.26
DIVIDENDS PER SHARE	$ 0.00	$ 0.00	$ 0.10	$ 0.10
WEIGHTED AVERAGE OF SHARES, basic and diluted	2,578,315	2,578,315	2,578,315	2,578,315