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Segment Information (Tables)
 3 Months Ended
Apr. 02, 2016
Segment Information [Abstract]  
Segment financial information
Segment financial information follows:

   
Three Months Ended
 
   
April 2, 2016
  
April 4, 2015
 
Revenues:
      
Sales to unaffiliated customers:
      
Industrial Hardware
 
$
14,591,513
  
$
14,786,666
 
Security Products
  
14,197,217
   
14,100,916
 
Metal Products
  
4,312,927
   
7,989,260
 
   
$
33,101,657
  
$
36,876,842
 
         
Income before income taxes:
        
Industrial Hardware
 
$
697,196
  
$
731,545
 
Security Products
  
1,128,196
   
786,291
 
Metal Products
  
(864,528
)  
(146,353
)
Operating Profit
  
960,864
   
1,371,483
 
Interest expense
  
(36,285
)  
(52,825
)
Other income
  
21,374
   
7,007
 
      Income before income taxes
 
$
945,953
  
$
1,325,665