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Subsequent Events	6 Months Ended
	Oct. 31, 2012
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Note 15. Subsequent Events On November 30, 2012, Cephalon, Inc., (“Cephalon”), a wholly-owned subsidiary of Teva Pharmaceutical Industries Ltd., exercised the option to pay a one-time fee of $880,000 to the Company, in lieu of any future milestone or royalty payments, for one compound tested under the agreement described in Note 10. Written notice was provided to the Company on December 3, 2012. This payment is due within 30 days from the date of exercise. As of the date of this filing, this amount is still outstanding.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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