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Payables to Former Subsidiaries (Tables)
 9 Months Ended
Sep. 30, 2018
Schedule of Trade Payable To a Former Subsidiary [Table Text Block]
    December 31,     September 30,  
    2017     2018  
BAK Tianjin $ 282,682   $ 161,033  
BAK Shenzhen   22,020,039     1,094,011  
  $ 22,302,721   $ 1,255,044