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Note I - Stock Based Compensation (Details) - Options Exercised (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Options Exercised [Abstract]    
Options Exercised (in Shares) 16,750 1,500
Cash Received from Option Exercises $ 268 $ 35
Intrinsic Value of Options Exercised $ 347 $ 34