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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventories [Abstract]  
Schedule of inventories
    June 30,
2017		     December 31, 2016  
Raw materials   $ 1,250,199     $ 1,003,359  
Work-in-process     1,475,058       639,345  
Finished goods     788,055       772,652  
      3,513,312       2,415,356  
Less: reserve for obsolete inventories     (21,688 )     (21,177 )
    $ 3,491,624     $ 2,394,179