STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 26,975,406	$ 29,204,818	$ 26,870,297
Cost of revenues	14,258,465	14,066,652	11,476,263
Gross profit	12,716,941	15,138,166	15,394,034
Operating Expenses:
General & administrative	4,560,684	4,474,654	4,157,597
Marketing & selling	5,053,217	4,625,375	4,704,970
Research & development	1,631,664	1,348,496	825,102
Total Operating Expenses	11,245,565	10,448,525	9,687,669
Operating income	1,471,376	4,689,641	5,706,365
Other income (expense)	(124,588)	(56,576)	92,273
Net income before provision for income taxes	1,346,788	4,633,065	5,798,638
(Benefit from) / provision for income taxes	(164,388)	1,426,984	1,993,428
Net income and comprehensive income	$ 1,511,176	$ 3,206,081	$ 3,805,210
Basic net income per share (in dollars per share)	$ 0.28	$ 0.6	$ 0.72
Diluted net income per share (in dollars per share)	0.28	0.6	0.72
Dividends declared per share (in dollars per share)	$ 0.6	$ 0.6	$ 0.6
Weighted average common shares outstanding, basic (in shares)	5,405,032	5,355,367	5,299,060
Weighted average common shares outstanding, diluted (in shares)	5,412,487	5,376,998	5,315,463