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Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Sep. 13, 2012
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Description Each share issued pursuant to a stock option will reduce the shares available for grant by one, and each share issued pursuant to an award of restricted stock or restricted stock units will reduce the shares available for grant by two.    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares) 311,074   14,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 27,159    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share) $ 24.95    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 4 years 292 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 14,908    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 2,340    
Allocated Share-based Compensation Expense 2,420 2,060  
Restricted Stock Units (RSUs) [Member] | Certain Officers And Key Employees [Member]
     
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares) 77,650    
Restricted Stock Units (RSUs) [Member]
     
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 6,150    
Stock Options [Member]
     
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,399    
2009 Stock Incentive Plan [Member]
     
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 4,151,308    
Certain Officers And Key Employees [Member]
     
Note 5 - Disclosure of Compensation Related Costs, Stock Based Payments (Details) [Line Items]      
Shares Granted Date June 7, 2013 and June 19, 2013    
Vesting Period May 1, 2014