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Net Income per Common Share (Tables)
 12 Months Ended
Dec. 31, 2015
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,
 
2015
 
2014
 
2013
Net income
$
12,050,000

 
$
9,634,000

 
$
6,866,000

 
 
 
 
 
 
Weighted average common shares outstanding — basic
7,583,000

 
7,508,000

 
7,220,000

Effect of dilutive securities
40,000

 
45,000

 
215,000

Weighted average common and potentially issuable common shares outstanding — diluted
7,623,000

 
7,553,000

 
7,435,000

 
 
 
 
 
 
Basic net income per common share
$
1.59

 
$
1.28

 
$
0.95

Diluted net income per common share
$
1.58

 
$
1.28

 
$
0.92