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Schedule II - Valuation and qualifying accounts
12 Months Ended
Dec. 31, 2012
Schedule II - Valuation and qualifying accounts [Abstract]  
Schedule II - Valuation and qualifying accounts

YEARS ENDED DECEMBER 31, 2012, 2011 AND 2010

 

Note Description   Balance at
Beginning of
Year
    Additions     Deductions     Balance at End
of Year
 
                         
Year ended December 31, 2012                                
Tax valuation allowance   $ 39,133,355     $ 10,467,065             $ 49,600,420  
Year ended December 31, 2011                                
Tax valuation allowance   $ 35,235,982     $ 3,897,373             $ 39,133,355  
Year ended December 31, 2010                                
Tax valuation allowance   $ 14,933,519     $ 20,302,463             $ 35,235,982