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BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts (in dollars) $ 2,078,944 $ 780,900
Preferred Stock, par value (in dollars per share) $ 1 $ 1
Common Stock, authorized shares 100,000,000 100,000,000
Common Stock, issued shares 25,318,700 23,974,114
Common Stock, outstanding shares 25,318,700 23,974,114
Class B
    
Preferred Stock, authorized shares 5,000,000 5,000,000
Series I, Class B
    
Preferred Stock, outstanding shares 103,500 144,000
Preferred Stock, liquidation preference (in dollars) 646,875 900,000
Series II, Class B
    
Preferred Stock, outstanding shares 178,700 219,700
Preferred Stock, liquidation preference (in dollars) 2,233,750 2,746,250
Series III, Class B
    
Preferred Stock, outstanding shares 130,245 130,245
Preferred Stock, liquidation preference (in dollars) 1,628,063 1,628,063
Series IV, Class B
    
Preferred Stock, outstanding shares 542,500 552,500
Preferred Stock, liquidation preference (in dollars) 5,967,500 6,077,500
Series V, Class B
    
Preferred Stock, outstanding shares 46,607 1,238,821
Preferred Stock, liquidation preference (in dollars) $ 205,071 $ 5,423,312