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Stock-based compensation and equity transactions (Tables)
 3 Months Ended
Jan. 31, 2013
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Computation of Weighted Average Fair Value of Employee Stock Options using Black-Scholes Option Pricing Model Assumptions

using the Black-Scholes option pricing model with the following assumptions:

 

    2013     2012  
Risk-free interest rate     0.36 %     0.39 %
Dividend yield     4.45 %     3.00 %
Expected life of the option     3.5 years       3.8 years  
Volatility factor     42.46 %     65.65 %
Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding

A summary of the status of the options granted under the Company’s stock option plans as of January 31, 2013 and the changes in options outstanding during the three months then ended is presented in the table that follows: 

    Shares     Weighted
Average Exercise Price		  
Outstanding at November 1, 2012     2,004,781     $ 2.25  
Options granted     171,900     $ 4.76  
Options exercised     (489,435 )   $ 2.68  
Options canceled or expired     (55,497 )   $ 3.75  
Options outstanding at January 31, 2013     1,631,749     $ 2.33  
Options exercisable at January 31, 2013     1,191,255     $ 1.95  
Options vested and expected to vest at January 31, 2013     1,609,668     $ 2.32