Commitments and Contingencies (Details Textual) (USD $)	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Corporate Headquarters [Member]
Lease Expiration Date	Apr. 30, 2014
Operating Leases, Rent Expense	$ 34,000	$ 34,000
Laboratories and Office Space [Member]
Lease Expiration Date	Apr. 30, 2014
Operating Leases, Rent Expense	43,000	33,000
Israel Office Headquarters [Member]
Lease Expiration Date	Jul. 31, 2013
Operating Leases, Rent Expense	6,000	14,000
Singapore Office Headquarters in Singapore [Member]
Lease Expiration Date	Jan. 31, 2014
Operating Leases, Rent Expense	$ 3,000	$ 0