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Note I - Stock Based Compensation (Tables)
9 Months Ended
Jan. 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
   
May 6, 2023
 
Shares available for grant at January 31, 2014
    -       367,500  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
January 31, 2014
   
January 31, 2013
 
Expected term (years)
    5.0       5.0  
Risk-free interest rate
    0.67%       0.78%  
Volatility
    50%       50%  
Dividend yield
           
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Nine Months Ended
January 31,
 
(Dollars in thousands)
 
2014
   
2013
 
             
Options Exercised
    30,500       28,500  
Cash Received from Option Exercises
  $ 719     $ 665  
Intrinsic Value of Options Exercised
  $ 563     $ 603