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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
The following is a summary of the basic and diluted earnings per share for the three month periods ended March 31, 2018 and March 31, 2017.

 
Three Months Ended March 31,
 
2018
 
2017
Net income available to common shareholders
$
3,414,771

 
$
1,448,851

Weighted average common shares outstanding
11,210,836

 
7,524,830

Effect of dilutive stock options
113,216

 
106,389

Diluted shares
11,324,052

 
7,631,219

Basic earnings per common share
$
0.30

 
$
0.19

Diluted earnings per common share
$
0.30

 
$
0.19