Statements of Operations (USD $)	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Sep. 25, 2010	Oct. 01, 2011	Sep. 25, 2010
Income Statement [Abstract]
Product sales	$ 4,508,250	$ 5,574,371	$ 13,848,477	$ 15,580,602
Research and development under cooperative agreement	392,790	433,352	1,734,668	1,022,990
Total revenues	4,901,040	6,007,723	15,583,145	16,603,592
Cost of product sales	3,651,046	4,151,008	11,250,968	11,767,887
Cost of research and development under cooperative agreement	358,002	372,441	1,624,710	917,036
Gross Margin	891,992	1,484,274	2,707,467	3,918,669
Selling, general and administrative expense	835,375	802,184	2,579,388	2,228,657
Operating income	56,617	682,090	128,079	1,690,012
Other income (expense), net	(8,528)	(7,306)	(26,264)	(23,782)
Net income before income tax expense	48,089	674,784	101,815	1,666,230
Income tax expense	20,500	254,000	44,900	631,000
Net income	$ 27,589	$ 420,784	$ 56,915	$ 1,035,230
Net income per basic common share	$ 0.00	$ 0.03	$ 0.00	$ 0.08
Weighted average number of basic common shares outstanding	12,748,149	12,648,640	12,733,312	12,659,519
Net income (loss) per diluted common share	$ 0.00	$ 0.03	$ 0.00	$ 0.08
Weighted average number of diluted common shares outstanding	13,190,317	12,998,593	13,199,666	12,975,415