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Commitments and Contingencies (Details Textual) (USD $)	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Corporate Headquarters [Member]
Lease Expiration Date	Apr. 30, 2014
Operating Leases, Rent Expense	$ 52,000	$ 52,000
Laboratories and Office Space [Member]
Lease Expiration Date	Jun. 30, 2014
Operating Leases, Rent Expense	69,000	49,000
Office Headquarters [Member]
Lease Expiration Date	Jul. 30, 2013
Operating Leases, Rent Expense	$ 21,000	$ 18,000

X

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration