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Note K - Stock-based Compensation Plans (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Stock Option Plan Comparison [Table Text Block]
    Restated Option Plan
Minimum exercise price as a percentage of fair market value at date of grant    
100
 %
Last expiration date for outstanding options    
March 13, 2027
  
Shares available for grant at April 30, 2017    
277,500
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    April 30, 2017   April 30, 2016   April 30, 2015
Expected terms (years)    
5.5
      
5.5
      
5.4
  
Risk-free interest rate    
1.47
 %    
1.55
 %    
1.64
 %
Volatility    
36
 %    
34
 %    
34
 %
Dividend yield    
-
      
-
      
-
  
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, 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
  
                                 
Granted    
45,000
    
$ 26.42
to
$ 34.09
    
1,301
      
28.90
  
Exercised    
(264,500
 )  
$ 11.90
to
$ 28.13
    
(4,363
 )    
17.92
  
Cancelled    
(30,250
 )  
$ 41.86
to
$ 53.02
    
(1,559
 )    
51.55
  
Outstanding at April 30, 2017    
1,028,500
    
 
 
 
   $
34,460
     $
33.51
  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
    Years Ended April 30,
(Dollars in thousands)   2017   2016   2015
             
Options Exercised    
264,500
      
30,750
      
212,250
  
Cash Received from Options Exercised   $
2,609
     $
400
     $
4,143
  
Intrinsic Value of Options Exercised   $
6,439
     $
943
     $
5,983
  
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, 2016    
9,500
     $
52.10
  
Shares granted    
10,000
      
39.14
  
Shares vested    
-
      
-
  
Shares cancelled    
(2,500
 )    
49.51
  
                 
Unvested shares at April 30, 2017    
17,000
     $
44.86