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Note K - Stock Based Compensation Plan (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2013
Vested [Member]
Employee Stock Option [Member]
Apr. 30, 2013
Employee Stock Option [Member]
Apr. 30, 2012
Employee Stock Option [Member]
Apr. 30, 2011
Employee Stock Option [Member]
Oct. 13, 2010
Employee Stock Option [Member]
Apr. 30, 2013
Stock Incentive Plan [Member]
Apr. 30, 2012
Stock Incentive Plan [Member]
Apr. 30, 2011
Stock Incentive Plan [Member]
Oct. 14, 2009
Stock Incentive Plan [Member]
Note K - Stock Based Compensation Plan (Details) [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in Shares) 860,500         860,500              
Share-based Compensation $ 1,852,000 $ 2,172,000 $ 2,885,000     $ 1,700,000 $ 2,000,000 $ 2,700,000   $ 123,000 $ 137,000 $ 188,000  
Allocated Share-based Compensation Expense, Net of Tax 1,200,000 1,400,000       1,100,000 1,300,000 1,700,000   78,000 86,000 118,000  
Number Of Stock Option Plans 2                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 200,000         1,500,000     1,000,000 350,000     150,000
Stock Options, Maximum Term 10 years                        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           1,400,000       195,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           328 days       1 year 9 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 784,000 $ 1,000,000 $ 244,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 28,000,000           28,500,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         5 years 138 days                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) $ 21.28 $ 20.46 $ 19.32 $ 19.24 $ 19.21                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 162,000 $ 92,000 $ 76,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 167,537                 187,027