Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Statement [Abstract]
Product sales	$ 5,130,022	$ 5,240,817	$ 11,082,102	$ 10,154,164
Research and development under cooperative agreement	4,640	59,725	38,611	177,456
Total revenues	5,134,662	5,300,542	11,120,713	10,331,620
Cost of product sales	4,072,492	3,887,713	8,491,852	7,906,468
Cost of research and development under cooperative agreement	3,834	49,531	32,156	147,418
Gross Margin	1,058,336	1,363,298	2,596,705	2,277,734
Selling, general, and administrative	1,153,214	1,008,118	2,279,002	1,908,032
Operating income (loss) from operations	(94,878)	355,180	317,703	369,702
Interest expense, net	(539)	(12,678)	(1,501)	(22,870)
Net income (loss) before income tax expense (benefit)	(95,417)	342,502	316,202	346,832
Income tax expense (benefit)	(38,000)	106,000	126,000	107,720
Net income (loss)	$ (57,417)	$ 236,502	$ 190,202	$ 239,112
Net income (loss) per basic common share	$ 0.00	$ 0.02	$ 0.01	$ 0.02
Weighted average number of basic common shares outstanding	13,084,968	12,961,506	13,077,273	12,916,633
Net income (loss) per diluted common share	$ 0.00	$ 0.02	$ 0.01	$ 0.02
Weighted average number of diluted common shares outstanding	13,084,968	13,091,084	13,705,570	13,101,855