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Schedule: II-Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Schedule: II-Valuation and Qualifying Accounts  
Schedule: II-Valuation and Qualifying Accounts

II—Valuation and Qualifying Accounts

        All other schedules are omitted as the required information is inapplicable or the information is presented in our consolidated financial statements or related notes.

Description
  Balance at
Beginning of
Year		   Charged to
Costs and
Expenses		   Deductions   Balance at
End of Year		  

Year ended December 31, 2012:

                          

Allowance for doubtful accounts and sales returns

   $ 150,921     257,310     104,392     303,839  

Year ended December 31, 2011:

                          

Allowance for doubtful accounts and sales returns

   $ 183,291     16,653     49,023     150,921  

Year ended December 31, 2010:

                          

Allowance for doubtful accounts and sales returns

   $ 162,315     102,860     81,884     183,291