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Grant Income (unaudited)	3 Months Ended
	Jul. 31, 2011
Grant Income [Abstract]
Grant Income [Text Block]	Note 11. Grant Income On October 29, 2010, the Company was notified that it was awarded total cash grants of approximately $1.5 million under the Qualifying Therapeutic Discovery Project program administered under section 48D of the Internal Revenue Code, of which approximately $1.0 million related to qualifying expenses the Company had previously incurred during fiscal 2010 and $0.5 million related to qualifying expenses which the Company expected to incur during fiscal 2011.  In November 2010, the Company received approximately $1.0 million and expects to receive $0.5 million related to the 2011 expenditures during the Company’s fiscal year.  To date, the $0.5 million has not been received.

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