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Inventories (Tables)
 9 Months Ended
Oct. 01, 2016
Inventories [Abstract]  
Components of inventories
The components of inventories follow:

   
October 1, 2016
  
January 2, 2016
 
       
Raw material and component parts
 
$
10,101,095
  
$
10,913,827
 
Work in process
  
7,109,543
   
7,681,576
 
Finished goods
  
16,888,189
   
18,247,010
 
   
$
34,098,827
  
$
36,842,413