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Note I - Stock Based Compensation (Tables)
3 Months Ended
Jul. 31, 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
 
May 6, 2023
Shares available for grant at July 31, 2013
    -       367,500  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
July 31, 2013
   
July 31, 2012
 
Expected term (years)
    5.0       5.0  
Risk-free interest rate
    0.67 %     0.82 %
Volatility
    50 %     50 %
Dividend yield
           
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Three Months Ended
July 31,
 
(Dollars in thousands)
2013
 
2012
 
             
Options Exercised
    1,500       -  
Cash Received from Option Exercises
  $ 35     $ -  
Intrinsic Value of Options Exercised
  $ 34     $ -