Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Income Statement [Abstract]
Net sales	$ 3,283	$ 3,742
Cost of sales	2,269	2,503
Gross profit	1,014	1,239
Operating expenses:
Selling	440	384
Marketing	97	88
Research and development	112	133
General and administrative	527	493
Total operating expenses	1,176	1,098
Income (loss) before interest expense and income taxes	(162)	141
Interest expense	6	6
Income (loss) before income taxes	(168)	135
Income tax expense	5	5
Net income (loss)	$ (173)	$ 130
Weighted average common shares outstanding:
Basic and diluted	5,154,000	5,154,000
Net income (loss) per common share:
Basic and diluted	$ (0.03)	$ 0.03