Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Income Statement [Abstract]
Product sales	$ 5,635,889	$ 5,130,022	$ 10,883,901	$ 11,082,102
Research and development under cooperative agreement		4,640	42,254	38,611
Total revenues	$ 5,635,889	5,134,662	10,926,155	11,120,713
Cost of product sales	$ 4,336,853	4,072,492	8,456,784	8,491,852
Cost of research and development under cooperative agreement		3,834	34,970	32,156
Gross Margin	$ 1,299,036	1,058,336	2,434,401	2,596,705
Selling, general, and administrative expense	1,112,295	1,153,214	2,125,133	2,279,002
Operating income (loss)	186,741	(94,878)	309,268	317,703
Interest income (expense), net	851	(539)	851	(1,501)
Net income (loss) before income tax expense (benefit)	187,652	(95,417)	310,119	316,202
Income tax expense (benefit)	73,760	(38,000)	122,500	126,000
Net income (loss)	$ 113,832	$ (57,417)	$ 187,619	$ 190,202
Net income (loss) per basic common share	$ 0.01	$ 0.00	$ 0.01	$ 0.01
Weighted average number of basic common shares outstanding	13,178,297	13,084,968	13,162,984	13,077,273
Net income (loss) per diluted common share	$ 0.01	$ 0.00	$ 0.01	$ 0.01
Weighted average number of diluted common shares outstanding	13,627,346	13,084,968	13,679,355	13,705,570