Condensed Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Feb. 26, 2022	Feb. 27, 2021
Income Statement [Abstract]
NET SALES	$ 6,066	$ 4,050
COST AND EXPENSES:
Cost of goods sold	3,276	2,690
Research and development	464	344
Selling, general and administrative expenses	1,768	1,390
Total cost and expenses	5,508	4,424
OPERATING INCOME (LOSS)	558	(374)
Other income, net	1	24
INCOME (LOSS) BEFORE TAXES	559	(350)
(Provision) benefit for taxes	95	(49)
NET INCOME (LOSS)	$ 464	$ (301)
NET INCOME (LOSS) PER SHARE, BASIC AND DILUTED	$ 0.18	$ (0.12)
DIVIDENDS PER SHARE	$ 0.10	$ 0.10
WEIGHTED AVERAGE OF SHARES, basic and diluted	2,578,315	2,578,315