Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Assets
Allowance for accounts receivable	$ 988,707	$ 796,610
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, Authorized (in shares)	1,500,000	1,500,000
Preferred stock, Issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized (in shares)	45,000,000	45,000,000
Common stock, Issued (in shares)	19,970,424	19,573,244
Common stock, outstanding (in shares)	19,966,149	19,573,244
Treasury stock (in shares)	4,275	0