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Net Income per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
The computation of basic and diluted net income per common share is as follows:
 
December 31,
 
2017
 
2016
 
2015
Net income
$
5,459,000

 
$
7,411,000

 
$
12,050,000

 
 
 
 
 
 
Weighted average common shares outstanding — basic
7,690,000

 
7,621,000

 
7,583,000

Effect of dilutive securities
57,000

 
40,000

 
40,000

Weighted average common and potentially issuable common shares outstanding — diluted
7,747,000

 
7,661,000

 
7,623,000

 
 
 
 
 
 
Basic net income per common share
$
0.71

 
$
0.97

 
$
1.59

Diluted net income per common share
$
0.70

 
$
0.97

 
$
1.58