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Deferred Government Grants (Tables)
6 Months Ended
Jun. 30, 2018
Schedule of Deferred Government Grants [Table Text Block]
      December 31,     June 30,  
      2017     2018  
  Total government grants $ 4,864,131   $ 4,706,671  
  Less: Current portion   (152,003 )   (149,417 )
  Non-current portion $ 4,712,128   $ 4,557,254