Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Significant Accounting Policies - Summary of Option Activity (Details)

v2.4.1.9
Description of Business and Significant Accounting Policies - Summary of Option Activity (Details) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2008
Jan. 31, 2015
Apr. 30, 2014
Summary of option activity, Shares      
Balance April 30, 2014   264,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted 8,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Expired   (16,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod  
Balance January 1, 2015   248,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 264,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable January 1, 2015   235,744us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Expected to vest January 1, 2015   224,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Summary of option activity, Weighted average exercise price      
Balance April 30, 2014   $ 12.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Expired   $ 15.42us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice  
Balance January 1, 2015   $ 12.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 12.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable January 1, 2015   $ 12.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Expected to vest January 1, 2015   $ 12.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice  
Summary of option activity, Additional disclosures      
Balance, Weighted average remaining contractual life   4 years 0 months 11 days [1] 4 years 5 months 16 days
Exercisable January 1, 2015, Weighted average remaining contractual life   3 years 9 months 22 days [1]  
Expected to vest January 1, 2015, Weighted average remaining contractual life   3 years 9 months 22 days [1]  
Balance April 30, 2014, Aggregate intrinsic value   $ 14,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Balance January 1, 2015, Aggregate intrinsic value      14,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable January 1, 2015, Aggregate intrinsic value       
Expected to vest January 1, 2015, Aggregate intrinsic value       
[1] This amount represents the weighted average remaining contractual life of stock options in years.