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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following is a summary of the basic and diluted earnings per share for the three month periods ended March 31, 2016 and March 31, 2015.
 
 
 
Three Months Ended March 31,
 
 
 
2016
 
2015
 
Net income available to common shareholders
 
$
1,136,863
 
$
308,392
 
Weighted average common shares outstanding
 
 
5,807,488
 
 
2,965,783
 
Effect of dilutive stock options
 
 
300,599
 
 
327,393
 
Diluted shares
 
 
6,108,087
 
 
3,293,176
 
Basic earnings per common share
 
$
0.20
 
$
0.10
 
Diluted earnings per common share
 
$
0.19
 
$
0.09