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Intangible Assets, net (Tables)
6 Months Ended
Jun. 30, 2018
SCHEDULE OF INTANGIBLE ASSETS [Table Text Block]
    December 31,     June 30,  
    2017     2018  
Computer software at cost $ 27,340   $ 26,875  
Accumulated amortization   (7,291 )   (8,510 )
  $ 20,049   $ 18,365