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Note K - Stock-Based Compensation Plans (Details) - Stock Incentive Plan (USD $)
12 Months Ended
Apr. 30, 2014
Stock Incentive Plan [Abstract]  
Unvested shares at April 30 23,500
Unvested shares at April 30 $ 23.66
Shares vested 3,500
Shares vested $ 19.06
Unvested shares at April 30 20,000
Unvested shares at April 30 $ 24.47