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Stock-based compensation and equity transactions (Tables)
6 Months Ended
Apr. 30, 2017
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
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 April 30, 2017 and the changes in options outstanding during the six months then ended is presented in the table that follows:
 
 
 
 
 
Weighted
 
 
 
 
 
Average
 
 
 
Shares
 
Exercise Price
 
Outstanding at November 1, 2016
 
 
1,007,851
 
$
4.07
 
Options granted
 
 
309,356
 
$
1.50
 
Options canceled or expired
 
 
(163,353)
 
$
3.80
 
Options outstanding at April 30, 2017
 
 
1,153,854
 
$
3.42
 
Options exercisable at April 30, 2017
 
 
807,735
 
$
3.52
 
Options vested and expected to vest at April 30, 2017
 
 
1,151,823
 
$
3.42