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Net Income per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
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:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Net income (loss)
$
(1,803,000
)
 
$
855,000

 
$
(839,000
)
 
$
4,704,000

 
 
 
 
 
 
 
 
Weighted average common shares outstanding — basic
7,804,000

 
7,711,000

 
7,758,000

 
7,683,000

Effect of dilutive securities
—

 
46,000

 
—

 
56,000

Weighted average common and potentially issuable common shares outstanding — diluted
7,804,000

 
7,757,000

 
7,758,000

 
7,739,000

 
 
 
 
 
 
 
 
Basic net income (loss) per common share
$
(0.23
)
 
$
0.11

 
$
(0.11
)
 
$
0.61

Diluted net income (loss) per common share
$
(0.23
)
 
$
0.11

 
$
(0.11
)
 
$
0.61