Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Income Statement [Abstract]
Product sales	$ 5,984,623	$ 5,918,725	$ 17,066,725	$ 16,072,889
Research and development under cooperative agreement	85,607	55,764	124,218	233,220
Total Revenues	6,070,230	5,974,489	17,190,943	16,306,109
Cost of product sales	4,658,194	4,209,683	13,150,046	12,116,150
Cost of research and development under cooperative agreement	72,861	46,654	105,017	194,072
Gross Margin	1,339,175	1,718,152	3,935,880	3,995,887
Selling, general and administrative	1,017,811	1,059,033	3,296,813	2,967,066
Operating income	321,364	659,119	639,067	1,028,821
Interest (expense), net	(299)	(3,603)	(1,800)	(26,473)
Net income before income tax expense	321,065	655,516	637,267	1,002,348
Income tax expense	127,000	204,000	253,000	311,720
Net income	$ 194,065	$ 451,516	$ 384,267	$ 690,628
Net income per basic common share	$ 0.01	$ 0.03	$ 0.03	$ 0.05
Weighted average number of basic common shares outstanding	13,091,819	13,198,506	13,082,135	13,010,591
Net income per diluted common share	$ 0.01	$ 0.03	$ 0.03	$ 0.05
Weighted average number of diluted common shares outstanding	13,737,953	13,522,495	13,716,378	13,242,069