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Payables to Former Subsidiaries (Tables)
 6 Months Ended
Jun. 30, 2018
Schedule of Trade Payable To a Former Subsidiary [Table Text Block]
    December 31,     June 30,  
    2017     2018  
BAK Tianjin $ 282,682   $ 241,691  
BAK Shenzhen   22,020,039     15,479,515  
  $ 22,302,721   $ 15,721,206