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Payables to Former Subsidiaries (Tables)
6 Months Ended
Jun. 30, 2017
Schedule of Advance From A Former Subsidiary [Table Text Block]
      December 31,     June 30,  
      2016     2017  
  BAK Tianjin $ 194,774   $ 230,988  
  Shenzhen BAK   2,294,085     6,994,958  
      2,488,859     7,225,946