CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Sales:
Products	$ 12,946,714	$ 12,411,530	$ 26,688,295	$ 20,927,867
Consulting services	741,301	787,874	1,446,898	1,454,868
Total sales	13,688,015	13,199,404	28,135,193	22,382,735
Cost of sales:
Products	5,605,548	6,393,805	11,613,449	9,388,682
Consulting services	426,197	471,581	887,972	850,951
Total cost of sales	6,031,745	6,865,386	12,501,421	10,239,633
Gross profit	7,656,270	6,334,018	15,633,772	12,143,102
Selling, general and administrative expenses	5,667,505	5,600,626	11,270,910	9,378,299
Research and development expenses	1,079,545	1,032,610	2,198,294	1,766,149
Operating income (loss)	909,220	(299,218)	2,164,568	998,654
Other income (expense), net	(86,303)	125,197	(190,682)	142,705
Income (loss) before income taxes	822,917	(174,021)	1,973,886	1,141,359
Income tax expense (benefit)	21,271	(31,862)	305,638	462,845
Net income (loss)	$ 801,646	$ (142,159)	$ 1,668,248	$ 678,514
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.14	$ (0.03)	$ 0.30	$ 0.12
Diluted (in dollars per share)	$ 0.14	$ (0.03)	$ 0.29	$ 0.12
Weighted average common shares outstanding:
Basic (in shares)	5,537,677	5,474,248	5,529,430	5,462,211
Diluted (in shares)	5,671,845	5,474,248	5,669,016	5,692,022
Cash dividends declared per common share (in dollars per share)	$ 0.11	$ 0.105	$ 0.22	$ 0.21