Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Sales:
Products	$ 47,054,868	$ 34,383,432	$ 28,858,044
Consulting services	2,885,657	2,977,435	2,690,585
Total sales	49,940,525	37,360,867	31,548,629
Cost of sales:
Products	20,893,294	12,284,206	11,001,813
Consulting services	1,713,314	1,608,364	1,382,196
Total cost of sales	22,606,608	13,892,570	12,384,009
Gross profit	27,333,917	23,468,297	19,164,620
Selling, general and administrative expenses	20,338,754	12,941,350	11,194,797
Research and development expenses	3,635,553	2,402,566	2,135,365
Operating income	3,359,610	8,124,381	5,834,458
Other income, net	20,512	79,599	628,912
Income before income taxes	3,380,122	8,203,980	6,463,370
Income taxes	1,378,148	2,753,062	1,944,986
Net income	$ 2,001,974	$ 5,450,918	$ 4,518,384
Net income per common share:
Basic (in dollars per share)	$ 0.37	$ 1.02	$ 0.87
Diluted (in dollars per share)	$ 0.35	$ 0.98	$ 0.84
Weighted average common shares outstanding:
Basic (in shares)	5,477,131	5,342,900	5,208,873
Diluted (in shares)	5,671,412	5,572,646	5,364,253
Dividends declared per common share (in dollars per share)	$ 0.42	$ 0.40	$ 0.38