Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Accounts receivable
Allowance for doubtful accounts	$ 480,320	$ 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
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares outstanding	8,153,176	8,149,801