Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Accounts receivable
Allowance for doubtful accounts	$ 282,350	$ 354,719
STOCKHOLDERS' EQUITY
Preferred stock, par value	$ 0.15	$ 0.15
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares outstanding	8,152,051	8,149,801