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Earnings per share
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share
 
The following is a summary of the basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017.

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Net income available to common shareholders
$
3,931,556

 
$
1,648,286

 
$
7,346,326

 
$
3,097,138

Weighted average common shares outstanding
12,201,185

 
8,216,567

 
11,708,746

 
7,872,609

Effect of dilutive stock options
119,313

 
108,971

 
113,751

 
104,673

Diluted shares
12,320,498

 
8,325,538

 
11,822,497

 
7,977,282

Basic earnings per common share
$
0.32

 
$
0.20

 
$
0.63

 
$
0.39

Diluted earnings per common share
$
0.32

 
$
0.20

 
$
0.62

 
$
0.39



For the three and six months ended June 30, 2018 and 2017, the effects of outstanding antidilutive stock options are excluded from the computation of diluted earnings per common share because the exercise price of such options is higher than the market price. There were no and 13,916 antidilutive stock options for the three and six months ended June 30, 2018 and 2017