Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Corporate Headquarters [Member]
Lease Expiration Date	Apr. 30, 2014
Operating Leases, Rent Expense	$ 69,000	$ 71,000
Laboratories and Office Space [Member]
Lease Expiration Date	Apr. 30, 2014
Operating Leases, Rent Expense	90,000	65,000
Israel Office Headquarters [Member]
Lease Expiration Date	Jul. 31, 2013
Operating Leases, Rent Expense	28,000	29,000
Singapore Office Headquarters in Singapore [Member]
Lease Expiration Date	Jan. 31, 2014
Operating Leases, Rent Expense	$ 2,000	$ 0