Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Significant Accounting Policies - Summary of option activity (Details)

v2.4.0.8
Description of Business and Significant Accounting Policies - Summary of option activity (Details) (USD $)
 3 Months Ended 12 Months Ended
Oct. 31, 2013
Apr. 30, 2013
Summary of option activity, Shares    
Granted 0  
Exercised 0  
Expired 21,246  
Balance October 31, 2013 290,329 311,575
Exercisable October 31, 2013 265,329  
Expected to vest October 31, 2013 276,000  
Summary of option activity, Weighted average exercise price    
Granted     
Exercised     
Expired $ 12.82  
Balance October 31, 2013 $ 12.28 $ 12.40
Exercisable October 31, 2013 $ 13.21  
Expected to vest October 31, 2013 $ 12.28  
Summary of option activity, Additional disclosures    
Balance, Weighted average remaining contractual life 4 years 8 months 26 days [1] 5 years 0 months 5 days [1]
Exercisable October 31, 2013, Weighted average remaining contractual life 4 years 3 months 19 days [1]  
Expected to vest October 31, 2013, Weighted average remaining contractual life 4 years 8 months 26 days [1]  
Granted, Aggregate intrinsic value     
Exercised, Aggregate intrinsic value     
Expired, Aggregate intrinsic value     
Balance October 31, 2013, Aggregate intrinsic value      
Exercisable October 31, 2013, Aggregate intrinsic value     
Expected to vest October 31, 2013, Aggregate intrinsic value     
Closing price of common stock on NASDAQ Stock Market $ 3.07  
[1] This amount represents the weighted average remaining contractual life of stock options in years.