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Note I - Stock Based Compensation (Tables)
3 Months Ended
Jul. 31, 2015
Notes Tables  
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       May 20, 2025  
Shares available for grant at July 31, 2015     -       80,750  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  Three Months Ended
July 31,
    2015   2014
Expected term (years)     5.5       5.0  
Risk-free interest rate     1.56 %     1.66 %
Volatility     34 %     35 %
Dividend yield     -       -  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
  Three Months Ended
July 31,
(Dollars in thousands)   2015   2014
Options Exercised     17,750       16,750  
Cash Received from Option Exercises   $ 245     $ 268  
Intrinsic Value of Options Exercised   $ 690     $ 347