CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 7,055,202	$ 6,459,775	$ 20,386,381	$ 19,565,350
Cost of revenues	2,879,150	2,742,072	8,644,109	8,079,141
Gross profit	4,176,052	3,717,703	11,742,272	11,486,209
Operating Expenses:
General & administrative	1,075,133	921,891	3,075,794	2,921,880
Marketing & selling	1,158,355	1,067,768	3,435,257	3,413,388
Research & development	203,265	297,090	558,011	679,031
Total Operating Expenses	2,436,753	2,286,749	7,069,062	7,014,299
Operating income	1,739,299	1,430,954	4,673,210	4,471,910
Other income	280	447	91,993	1,442
Net income before provision for income taxes	1,739,579	1,431,401	4,765,203	4,473,352
Provision for income taxes	687,579	552,920	1,827,932	1,766,336
Net income and comprehensive income	$ 1,052,000	$ 878,481	$ 2,937,271	$ 2,707,016
Basic net income per share (in dollars per share)	$ 0.20	$ 0.17	$ 0.55	$ 0.52
Diluted net income per share (in dollars per share)	$ 0.20	$ 0.17	$ 0.55	$ 0.51
Dividends declared per share (in dollars per share)	$ 0.15	$ 0.15	$ 0.45	$ 0.45
Weighted average common shares outstanding, basic (in shares)	5,312,105	5,272,428	5,301,330	5,256,240
Weighted average common shares outstanding, diluted (in shares)	5,330,515	5,289,808	5,314,224	5,266,237