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Note K - Stock Based Compensation Plan (Details) - Stock Incentive Plan (USD $)
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Stock Incentive Plan [Abstract]    
Number of Shares 23,500 27,000
Weighted Average Grant Date Fair Value (in Dollars per share) $ 23.66 $ 23.07
Shares vested 3,500  
Shares vested (in Dollars per share) $ 19.06