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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
SCHEDULE OF INVENTORIES [Table Text Block]
      December 31,     June 30,  
      2016     2017  
  Raw materials $ 2,570,942   $ 2,135,145  
  Work in progress   1,333,949     1,407,126  
  Finished goods   13,190,031     13,210,399  
    $ 17,094,922   $ 16,752,670