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Stock-based compensation and equity transactions (Tables)
 3 Months Ended
Jan. 31, 2018
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
Black-Scholes option pricing model with the following assumptions:
 
 
 
2018
 
 
2017
 
Risk-free interest rate
 
 
1.87
%
 
 
0.98
%
Dividend yield
 
 
3.28
%
 
 
5.33
%
Expected life of the option
 
 
4.54 years
 
 
 
3.50 years
 
Volatility factor
 
 
46.83
%
 
 
42.37
%
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, 2018 and the changes in options outstanding during the three months then ended is presented in the table that follows: 
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
Average
 
 
 
Shares
 
Exercise Price
 
Outstanding at November 1, 2017
 
 
1,159,771
 
$
3.19
 
Options granted
 
 
269,635
 
$
2.44
 
Options canceled or expired
 
 
(163,769)
 
$
4.86
 
Options outstanding at January 31, 2018
 
 
1,265,637
 
$
3.08
 
Options exercisable at January 31, 2018
 
 
817,913
 
$
3.10
 
Options vested and expected to vest at January 31, 2018
 
 
1,261,614
 
$
3.08