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Income Taxes (Details Textual) (USD $)
6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Income Taxes (Textual) [Abstract]    
Estimated Future Income Tax Benefit $ 5,400,000  
Unrecognized tax benefits 691,000  
Accrued interest and penalties related to uncertain tax positions $ 117,000 $ 111,000
Unrecognized tax benefits expected reversal period 12 months