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Note I - Stock Based Compensation (Tables)
6 Months Ended
Oct. 31, 2014
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
August 21, 2024
Shares available for grant at October 31, 2014
-
323,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Six Months Ended
October 31,
 
   
2014
   
2013
 
Expected term (years)
    5.3       5.0  
Risk-free interest rate
    1.65 %     0.67 %
Volatility
    35 %     50 %
Dividend yield
    -       -  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Six Months Ended
October 31,
 
(Dollars in thousands)
 
2014
   
2013
 
             
Options Exercised
    88,750       4,500  
Cash Received from Option Exercises
  $ 1,546     $ 105  
Intrinsic Value of Options Exercised
  $ 2,129     $ 91