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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
SCHEDULE OF INVENTORIES [Table Text Block]
    December 31,     June 30,  
    2017     2018  
Raw materials $ 1,814,704   $ 1,826,433  
Work in progress   2,188,193     1,634,652  
Finished goods   5,829,508     7,229,883  
  $ 9,832,405   $ 10,690,968