CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Sales:
Products	$ 13,741,581	$ 8,516,337
Consulting services	705,597	666,994
Total sales	14,447,178	9,183,331
Cost of sales:
Products	6,007,901	2,994,877
Consulting services	461,775	379,370
Total cost of sales	6,469,676	3,374,247
Gross profit	7,977,502	5,809,084
Selling, general and administrative expenses	5,603,405	3,777,673
Research and development expenses	1,118,750	733,539
Operating income	1,255,347	1,297,872
Other income (expense), net	(104,379)	17,508
Income before income taxes	1,150,968	1,315,380
Income tax expense	284,367	494,707
Net income	$ 866,601	$ 820,673
Net income per common share:
Basic (in dollars per share)	$ 0.16	$ 0.15
Diluted (in dollars per share)	$ 0.15	$ 0.14
Weighted average common shares outstanding:
Basic (in shares)	5,521,183	5,450,173
Diluted (in shares)	5,676,943	5,691,783
Cash dividends declared per common share (in dollars per share)	$ 0.11	$ 0.105