Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 3,143	$ 3,443	$ 6,644	$ 7,217
Cost of sales	2,283	2,429	4,801	4,923
Gross profit	860	1,014	1,843	2,294
Operating expenses:
Selling and warehouse	321	348	718	703
Marketing	93	56	177	138
Research and development	99	108	157	214
General and administrative	402	406	811	805
Total operating expenses	915	918	1,863	1,860
Income (loss) from operations	(55)	96	(20)	434
Interest expense	7	6	13	13
Income (loss) before income tax	(62)	90	(33)	421
Income tax expense			6	5
Net income (loss)	$ (62)	$ 90	$ (39)	$ 416
Weighted average common shares outstanding:
Basic and diluted	5,154,000	5,154,000	5,154,000	5,154,000
Earnings (loss) per common share:
Basic and diluted	$ (0.01)	$ 0.02	$ (0.01)	$ 0.08