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Lease Commitments (Detail Textuals) (USD $)
12 Months Ended 0 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Feb. 07, 2013
Citibank, N.A. (the "Sublandlord")
sqft
Operating Leased Assets [Line Items]        
Area of land for lease       44,493
Base rent under the sublease agreement per annum       $ 1,468,269
Security deposit in cash       489,423
Rental expenses 2,213,000 2,509,000 2,509,000  
Additional short term overlapping rent expense 771,000      
Operating lease exit cost related to relocation   $ 37,000