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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
Jul. 31, 2013
Apr. 30, 2013
Preferred stock, par value (in Dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in Dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 12,418,318 12,414,659
Common stock, shares outstanding 9,017,929 9,023,290
Treasury stock, shares 3,400,389 3,391,369