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Earnings per share (Tables)
 6 Months Ended
Apr. 30, 2013
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 April 30,     Six Months Ended April 30,  
    2013     2012     2013     2012  
                         
Weighted average shares outstanding for basic earnings per share     7,610,309       6,872,439       7,337,101       6,938,395  
                                 
Add effects of potentially dilutive securities-assumed exercise of stock options     851,235       751,366       912,354       734,871  
                                 
Weighted average shares for diluted net earnings per share     8,461,544       7,623,805       8,249,455       7,673,266