Quarterly report pursuant to Section 13 or 15(d)

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

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Description of Business and Significant Accounting Policies - Summary of option activity (Details) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2014
Apr. 30, 2013
Summary of option activity, Shares    
Granted     
Exercised     
Expired 32,164  
Balance January 31, 2014 279,411 311,575
Exercisable January 31, 2014 254,411  
Expected to vest January 31, 2014 265,000  
Summary of option activity, Weighted average exercise price    
Granted     
Exercised     
Expired $ 14.37  
Balance January 31, 2014 $ 12.17 $ 12.40
Exercisable January 31, 2014 $ 13.13  
Expected to vest January 31, 2014 $ 12.17  
Summary of option activity, Additional disclosures    
Balance, Weighted average remaining contractual life 4 years 5 months 20 days 5 years 0 months 7 days [1]
Exercisable January 31, 2014, Weighted average remaining contractual life 4 years 0 months 4 days  
Expected to vest January 31, 2014, Weighted average remaining contractual life 4 years 5 months 20 days  
Granted, Aggregate intrinsic value     
Exercised, Aggregate intrinsic value     
Expired, Aggregate intrinsic value     
Balance January 31, 2014, Aggregate intrinsic value      
Exercisable January 31, 2014, Aggregate intrinsic value     
Expected to vest January 31, 2014, Aggregate intrinsic value     
[1] This amount represents the weighted average remaining contractual life of stock options in years.