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Trade Accounts Receivable, net
 6 Months Ended
Mar. 31, 2013
Trade Accounts Receivable, net [Text Block]

3. Trade Accounts Receivable, net

Trade accounts receivable as of September 30, 2012 and March 31, 2013 consisted of the following:

      September 30,     March 31,  
      2012     2013  
               
  Trade accounts receivable $ 107,781,638   $ 81,666,911  
  Less: Allowance for doubtful accounts   (33,244,428 )   (31,531,678 )
      74,537,210     50,135,233  
  Bills receivable   2,912,381     6,306,300  
    $ 77,449,591   $ 56,441,533  

An analysis of the allowance for doubtful accounts is as follows:

      Six months ended  
      March 31,2013  
  Balance at October 1, 2012 $ 33,244,428  
  Provision for the period   3,960,154  
  Recoveries for the period   (6,097,786 )
  Foreign exchange adjustment   424,882  
         
  Balance at March 31, 2013 $ 31,531,678