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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
Jul. 31, 2011
Apr. 30, 2011
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 12,278,716 12,276,658
Common stock, shares outstanding 10,110,166 10,496,628
Treasury stock, shares 2,168,550 1,780,030