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Deferred government grant (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of Deferred Government Grants [Table Text Block]
    September 30,     December 31,     December 31,  
    2016     2016     2017  
Total government grants $ 4,928,830   $ 4,699,261   $ 4,864,131  
Less: Current   (197,645 )   (142,400 )    (152,003 ) 
  $ 4,731,185   $ 4,556,861   $ 4,712,128