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Note K - Stock-Based Compensation Plans (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2014
Employee Stock Option [Member]
1997 Plan [Member]
Apr. 30, 2014
Employee Stock Option [Member]
Apr. 30, 2013
Employee Stock Option [Member]
Apr. 30, 2012
Employee Stock Option [Member]
Oct. 13, 2010
Employee Stock Option [Member]
Original Amount [Member]
Oct. 13, 2010
Employee Stock Option [Member]
Revised Amount [Member]
Apr. 30, 2014
Restricted Stock [Member]
Apr. 30, 2013
Restricted Stock [Member]
Apr. 30, 2012
Restricted Stock [Member]
Apr. 30, 2014
Stock Incentive Plan [Member]
Apr. 30, 2014
Stock Incentive Plan [Member]
Apr. 30, 2013
Stock Incentive Plan [Member]
Apr. 30, 2012
Stock Incentive Plan [Member]
Oct. 14, 2009
Stock Incentive Plan [Member]
Original Amount [Member]
Oct. 14, 2009
Stock Incentive Plan [Member]
Revised Amount [Member]
Note K - Stock-Based Compensation Plans (Details) [Line Items]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in Shares) 946,000                                  
Allocated Share-based Compensation Expense $ 1,400,000 $ 1,900,000     $ 1,300,000 $ 1,700,000 $ 2,000,000             $ 105,000 $ 123,000 $ 137,000    
Allocated Share-based Compensation Expense, Net of Tax 873,000 1,200,000     791,000 1,100,000 1,300,000             66,000 78,000 86,000    
Number Of Stock Option Plans 2                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)       0                 187,027          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)               1,000,000 1,500,000               150,000 350,000
Stock Options, Maximum Term         10 years                          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         597,000                 90,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year                 1 year        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 487,000 $ 784,000 $ 1,000,000                              
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 16,800,000 28,000,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 15,500,000                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 244 days                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share) $ 20.14                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 126,000 $ 162,000 $ 92,000                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)                   0 0 0