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Note I - Stock Based Compensation (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Employee Stock Option [Member]
2007 Plan [Member]
Oct. 13, 2010
Employee Stock Option [Member]
2007 Plan [Member]
Oct. 12, 2010
Employee Stock Option [Member]
2007 Plan [Member]
Jul. 31, 2014
Employee Stock Option [Member]
Jul. 31, 2013
Employee Stock Option [Member]
Jul. 31, 2014
Restricted Stock [Member]
Stock Incentive Plan [Member]
Jul. 31, 2013
Restricted Stock [Member]
Stock Incentive Plan [Member]
Jul. 31, 2014
2007 Plan [Member]
Jul. 31, 2014
Stock Incentive Plan [Member]
Jul. 31, 2013
Stock Incentive Plan [Member]
Jan. 31, 2014
Stock Incentive Plan [Member]
Oct. 14, 2009
Original Amount [Member]
Stock Incentive Plan [Member]
Oct. 14, 2009
Revised Amount [Member]
Stock Incentive Plan [Member]
Note I - Stock Based Compensation (Details) [Line Items]                              
Allocated Share-based Compensation Expense $ 266,000 $ 644,000       $ 229,000 $ 604,000       $ 23,000 $ 26,000      
Allocated Share-based Compensation Expense, Net of Tax 166,000 406,000       143,000 381,000       14,000 16,000      
Number of Stock Option Plans 2                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)       1,500,000 1,000,000                 150,000 350,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 20,000 25,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value 244,000 487,000                          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           411,000         68,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           328 days         292 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 17,800,000 24,800,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in Shares) 974,250                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 16,600,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 4 years 222 days                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in Dollars per share) $ 20.75                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)               0 0            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)                   347,500     187,027    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares)                         20,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in Dollars per share)                         $ 24.47