CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues	$ 6,898,737	$ 6,861,720	$ 13,331,179	$ 13,105,575
Cost of revenues	2,819,788	2,758,334	5,764,959	5,337,069
Gross profit	4,078,949	4,103,386	7,566,220	7,768,506
Operating Expenses:
General & administrative	1,006,950	1,004,548	2,000,661	1,999,989
Marketing & selling	1,150,244	1,220,794	2,276,902	2,345,619
Research & development	190,036	213,894	354,746	381,942
Total Operating Expenses	2,347,230	2,439,236	4,632,309	4,727,550
Operating income	1,731,719	1,664,150	2,933,911	3,040,956
Other income	300	485	91,713	995
Net income before provision for income taxes	1,732,019	1,664,635	3,025,624	3,041,951
Provision for income taxes	669,093	663,591	1,140,353	1,213,416
Net income and comprehensive income	$ 1,062,926	$ 1,001,044	$ 1,885,271	$ 1,828,535
Basic net income per share (in dollars per share)	$ 0.20	$ 0.19	$ 0.36	$ 0.35
Diluted net income per share (in dollars per share)	$ 0.20	$ 0.19	$ 0.36	$ 0.35
Dividends declared per share (in dollars per share)	$ 0.15	$ 0.15	$ 0.30	$ 0.30
Weighted average common shares outstanding, basic (in shares)	5,305,296	5,260,462	5,289,066	5,248,011
Weighted average common shares outstanding, diluted (in shares)	5,316,657	5,266,461	5,304,129	5,255,354