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Receivables from Former Subsidiaries, trade payable to and advance from former subsidiaries (Tables)
 9 Months Ended
Jun. 30, 2015
Schedule of Receivable From A Former Subsidiary [Table Text Block]
      September 30,     June 30,  
      2014     2015  
  Shenzhen BAK $ 1,856,356   $   -  
  BAK Tianjin   7,261,089     -  
      9,117,445     -  
  Allowance for doubtful debts   (1,856,356 )   -  
  Carrying amount $ 7,261,089   $   -  
Schedule of Trade Payable To a Former Subsidiary [Table Text Block]
      September 30,     June 30,  
      2014     2015  
  BAK Tianjin $   -   $ 2,555,860  
Schedule of Advance From A Former Subsidiary [Table Text Block]
      September 30,     June 30,  
      2014     2015  
  Shenzhen BAK $   - $     77,134