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Earnings per share (Tables)
 9 Months Ended
Jul. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Weighted Average Shares Outstanding
The following table summarizes the computation of basic and diluted weighted average shares outstanding:
 
 
 
Three Months Ended July 31,
 
Nine Months Ended July 31,
 
 
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding for basic earnings per share
 
 
8,838,027
 
 
8,834,747
 
 
8,835,852
 
 
8,770,375
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Add effects of potentially dilutive securities-assumed exercise of stock options
 
 
77,767
 
 
-
 
 
50,543
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding for diluted earnings per share
 
 
8,915,794
 
 
8,834,747
 
 
8,886,395
 
 
8,770,375