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Inventories (Tables)
 3 Months Ended
Apr. 01, 2017
Inventories [Abstract]  
Components of inventories
The components of inventories follow:

 
 
April 1, 2017
  
December 31, 2016
 
 
      
Raw material and component parts
 
$
8,433,550
  
$
8,829,236
 
Work in process
  
6,799,146
   
7,118,149
 
Finished goods
  
17,272,507
   
18,082,901
 
 
 
$
32,505,203
  
$
34,030,286