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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventories [Abstract]  
Schedule of inventories

 

  March 31, 2018  December 31, 2017 
Raw materials $1,188,467  $998,751 
Work-in-process  2,790,423   2,629,570 
Finished goods  1,545,373   1,239,168 
   5,524,263   4,867,489 
Less: reserve for obsolete inventories  (319,995)  (313,930)
  $5,204,268  $4,553,559