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Note K - Stock Based Compensation Plan (Tables)
 12 Months Ended
Apr. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Plan Comparison [Table Text Block]
 
1997 Plan
 
2007 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 27, 2022
Shares available for grant at April 30, 2013
-
 
392,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
April 30, 2013
April 30, 2012
April 30, 2011
Expected terms (years)
5.0
5.0
5.0
Risk-free interest rate
0.78%
1.48%
1.80%
Volatility
50%
50%
50%
Dividend yield
-
-
-
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number
of
Shares
   
Exercise
Price
per Share
   
Proceeds
on
Exercise
   
Weighted Average
Exercise Price per
Share
 
                   
(in thousands)
       
Outstanding at April 30, 2010
    1,110,397     $6.59 to $24.47     $
21,366
    $ 19.24  
                                   
Granted
    23,750         $22.87      
543
      22.87  
Expired
    (1,000 )       $11.62       (12 )     11.62  
                                   
Outstanding at April 30, 2011
    1,133,147     $6.59 to $24.47     $
21,897
    $ 19.32  
                                   
Granted
    73,750     $24.69 to $45.72      
2,355
      31.93  
Exercised
    (88,647 )   $6.59 to $24.69       (1,371 )     15.46  
                                   
Outstanding at April 30, 2012
    1,118,250     $11.83 to $45.72     $
22,881
    $ 20.46  
                                   
Granted
    40,000     $44.14 to $45.46      
1,801
      45.02  
Exercised
    (35,750 )   $11.83 to $23.34       (790 )     22.13  
                                   
Outstanding at April 30, 2013
    1,122,500     $11.90 to $45.72     $
23,892
    $ 21.28  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
   
Twelve Months Ended
April 30,
 
(Dollars in thousands)
 
2013
   
2012
   
2011
 
                   
Options Exercised
    35,750       88,647       -  
Cash Received from Option Exercises
  $ 791     $ 1,370     $ -  
Intrinsic Value of Options Exercised
  $ 811     $ 1,520     $ -  
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, 2012
    27,000     $ 23.07  
Shares granted
    -       -  
Shares vested
    3,500       19.06  
                 
Unvested shares at April 30, 2013
    23,500     $ 23.66