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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Accounts receivable, less allowance for doubtful accounts $ 637,860 $ 454,632
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued      
Treasury stock, Class A common stock shares 2,752,245 2,719,658
Class A common stock [Member]
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 8,897,440 8,819,290
Common stock, shares outstanding 6,145,195 6,099,632
Class B Common Stock [Member]
    
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