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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Accounts receivable, less allowance for doubtful accounts $ 524,066 $ 637,860
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Treasury stock, Class A common stock shares 2,786,625 2,752,245
Class A Common Stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 8,977,790 8,897,440
Common stock, shares outstanding 6,191,165 6,145,195
Class B Common Stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 16,662,743 16,662,743
Common stock, shares outstanding 16,662,743 16,662,743