Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Statement [Abstract]
Net sales	$ 3,646	$ 3,554	$ 6,929	$ 7,296
Cost of sales	2,473	2,370	4,742	4,873
Gross profit	1,173	1,184	2,187	2,423
Operating expenses:
Selling and warehouse	357	349	797	733
Marketing	62	43	158	131
Research and development	90	116	201	249
General and administrative	388	474	917	967
Total operating expenses	897	982	2,073	2,080
Income from operations	276	202	114	343
Interest expense	6	6	12	13
Income before income tax	270	196	102	330
Income tax expense		2	5	6
Net income	$ 270	$ 194	$ 97	$ 324
Weighted average common shares outstanding:
Basic and diluted	5,154,000	5,154,000	5,154,000	5,154,000
Net income per common share:
Basic and diluted	$ 0.05	$ 0.04	$ 0.02	$ 0.06