Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 26, 2017	Aug. 27, 2016	Aug. 26, 2017	Aug. 27, 2016
Income Statement [Abstract]
NET SALES	$ 4,717	$ 3,804	$ 13,591	$ 13,120
COST AND EXPENSES:
Cost of goods sold	(2,952)	(2,697)	(8,526)	(8,779)
Research and development	(413)	(359)	(1,305)	(907)
Selling, general & administrative expenses	(1,034)	(970)	(3,006)	(3,060)
Total cost and expenses	(4,399)	(4,026)	(12,837)	(12,746)
OPERATING INCOME (LOSS)	318	(222)	754	374
Other income	19	16	23	22
Interest income (expense), net	8	(1)	10	(1)
INCOME (LOSS) BEFORE TAXES	345	(207)	787	395
Benefit (provision) for taxes	32	66	(109)	(126)
NET INCOME (LOSS)	$ 377	$ (141)	$ 678	$ 269
NET INCOME (LOSS) PER SHARE, BASIC AND DILUTED	$ 0.15	$ (0.05)	$ 0.26	$ 0.10
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