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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts VALUATION AND QUALIFYING ACCOUNTS

VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2011 and 2012

 

                                 

Column A Description

   Column B
Balance  at
Beginning
of Period		     Column C
Charged to
Costs and
Expenses		     Column D
Deductions		     Column E
Balance at
End of
Period		  

Year ended December 31, 2011:

                                

Allowance for doubtful accounts (deducted from accounts receivable)

     907,819       1,164,058       1,617,245       454,632  

Valuation allowance for deferred tax assets

     594,366       74,665       15,112       653,919  

Year ended December 31, 2012:

                                

Allowance for doubtful accounts (deducted from accounts receivable)

     454,632       1,219,698       1,036,470       637,860  

Valuation allowance for deferred tax assets

     653,919       1,940       12,307       643,552