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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill [Abstract]  
Roll-forward of goodwill
The following is a roll-forward of goodwill from year-end 2016 to the end of the third quarter of 2017:

  
Industrial
Hardware
 Segment
  
Security
Products
 Segment
  
Metal
Products
 Segment
  


 Total
 
             
Beginning balance
 
$
1,760,793
  
$
13,059,042
  
$
—
  
$
14,819,835
 
 Investment - Velvac  17,502,024    
—
   
—
   17,502,024  
Foreign exchange
  
73,881
   
—
   
—
   
73,881
 
Ending balance
 
$
19,336,698
  
$
13,059,042
  
$
—
  
$
32,395,740