Inventories consist of the following at:

 
 
December 31, 2016
  
December 31, 2015
 
Raw materials
 
$
1,824,248
  
$
2,248,371
 
Work in process
  
535,320
   
370,340
 
Finished goods
  
975,620
   
959,314
 
 
 
$
3,335,188
  
$
3,578,025