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Note K - Stock-based Compensation Plans (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Stock Option Plan Comparison [Table Text Block]
    1997 Plan   Restated Option Plan
Minimum exercise price as a percentage of fair market value at date of grant     100%     100%
Last expiration date for outstanding options    
July 2, 2017
     
March 2, 2026
 
Shares available for grant at April 30, 2016     -       263,250  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    April 30, 2016   April 30, 2015   April 30, 2014
Expected terms (years)     5.5       5.4       5.0  
Risk-free interest rate     1.55%     1.64%     0.67%
Volatility     34%     34%     50%
Dividend yield     -       -       -  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
    Number   Exercise   Proceeds   Weighted Average
    of   Price   on   Exercise Price per
    Shares   per Share   Exercise   Share
            (in thousands)    
Outstanding at April 30, 2013     1,122,500     $11.90 to $45.72   $ 23,892     $ 21.28  
                                 
Granted     25,000     $44.52 to $46.44     1,122       44.90  
Exercised     (30,500 )   $23.34 to $23.75     (720 )     23.58  
                                 
Outstanding at April 30, 2014     1,117,000     $11.90 to $46.44   $ 24,294     $ 21.75  
                                 
Granted     89,000     $36.54 to $50.25     3,997       44.91  
Exercised     (212,250 )   $11.90 to $45.46     (4,143 )     19.52  
Cancelled     (12,000 )   $41.86 to $45.72     (540 )     45.08  
                                 
Outstanding at April 30, 2015     981,750     $11.90 to $53.02   $ 23,608     $ 24.05  
                                 
Granted     338,750     $26.37 to $53.02     16,471       48.62  
Exercised     (30,750 )   $11.90 to $23.34     (400 )     13.00  
Cancelled     (11,500 )   $41.86 to $53.02     (598 )     52.05  
                                 
Outstanding at April 30, 2016     1,278,250             $ 39,081     $ 30.57  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
    Twelve Months Ended
April 30,
(Dollars in thousands)   2016   2015   2014
Options Exercised     30,750       212,250       30,500  
Cash Received from Options Exercised   $ 400     $ 4,143     $ 720  
Intrinsic Value of Options Exercised   $ 943     $ 5,983     $ 563  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Number
of
Shares
  Weighted Average
Grant Date
Fair Value
Unvested shares at April 30, 2015     9,500     $ 52.10  
Shares granted     -          
Shares vested     -          
                 
Unvested shares at April 30, 2016     9,500     $ 52.10