Consolidated Statements Of Operations (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Net sales and revenues	$ 20,222,369	$ 22,975,600	$ 20,851,144
Cost of sales and revenues	12,326,085	12,880,664	12,120,975
Gross profit	7,896,284	10,094,936	8,730,169
Operating expenses:
Selling, general and administrative expenses	3,773,942	3,790,760	3,762,291
Research and development expenses	1,993,183	1,887,318	1,635,161
Total operating expenses	5,767,125	5,678,078	5,397,452
Operating income	2,129,159	4,416,858	3,332,717
Financing income, net	101,515	50,534	214,884
Income before income taxes	2,230,674	4,467,392	3,547,601
Income tax expense	710,000	1,480,000	1,319,000
Net income	$ 1,520,674	$ 2,987,392	$ 2,228,601
Net income per share:
Basic income per share	$ 0.33	$ 0.65	$ 0.49
Diluted income per share	$ 0.31	$ 0.60	$ 0.45