Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Corporate Headquarters [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Nov. 30, 2016
Operating Leases, Rent Expense	$ 21,000	$ 17,000
Laboratories and Office Space [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Jun. 30, 2014
Operating Leases, Rent Expense	22,000	22,000
Israel Office Headquarters [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Jul. 31, 2013
Operating Leases, Rent Expense	0	5,600
Singapore Office Headquarters in Singapore [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Jan. 31, 2015
Operating Leases, Rent Expense	1,300	1,400
New York Laboratory [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Mar. 31, 2014
Operating Leases, Rent Expense	$ 11,600