Condensed Consolidated Balance Sheets [Parenthetical] - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 286,489	$ 370,909
Preferred stock, par value (in dollars per share)	$ 0.15	$ 0.15
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.15	$ 0.15
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	10,494,011	10,487,511
Common stock, shares outstanding	10,494,011	10,487,511