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Note K - Stock-based Compensation Plans (Tables)
 12 Months Ended
Apr. 30, 2018
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  
May 1, 2027
Shares available for grant at April 30, 2018  
297,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    April 30, 2018   April 30, 2017   April 30, 2016
Expected terms (years)  
5.5
  
5.5
  
5.5
Risk-free interest rate  
1.81%
  
1.47%
  
1.55%
Volatility  
36%
  
36%
  
34%
Dividend yield  
-
  
-
  
-
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Number of Options   Exercise Price per Share   Proceeds on Exercise   Weighted Average Exercise Price per Share
            (in thousands)    
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
    
(4,739
 )    
17.92
  
Cancelled    
(30,250
 )  
$41.86
to
$53.02
    
(1,559
 )    
51.55
  
Outstanding at April 30, 2017    
1,028,500
    
 
   $
34,084
     $
33.51
  
Granted    
25,000
    
 
$37.30
 
    
933
      
37.30
  
Exercised    
(323,000
 )  
$11.90
to
$37.94
    
(6,692
 )    
20.72
  
Expired    
(15,000
 )  
$44.52
-
$51.81
    
(710
 )    
47.26
  
Cancelled    
(20,000
 )  
$41.86
to
$53.02
    
(932
 )    
46.61
  
Outstanding at April 30, 2018    
695,500
    
 
   $
26,683
     $
30.50
  
Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]
    Years Ended April 30,
(Dollars in thousands)   2018   2017   2016
             
Options Exercised    
323,000
      
264,500
      
30,750
  
Cash Received from Options Exercised   $
2,832
     $
2,609
     $
400
  
Intrinsic Value of Options Exercised   $
8,381
     $
6,439
     $
943
  
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    
-
      
-
  
Shares cancelled    
-
      
-
  
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
  
Shares granted    
166,500
      
45.86
  
Shares vested    
-
      
-
  
Shares cancelled    
(4,500
 )    
38.28
  
Unvested shares at April 30, 2018    
179,000
     $
45.96