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Grant Income	9 Months Ended
Jan. 31, 2012
Grant Income [Abstract]
Grant Income [Text Block]	Note 10. Grant Income In October 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 related to the 2010 expenditures. As of January 31, 2012, $0.5 million related to the 2011 expenditures was still outstanding. The Company received this payment on February 13, 2012. On August 8, 2011 the Company was notified that it was selected for a tax examination by the Internal Revenue Service (IRS) on the Application for Certification of Qualified Investments Eligible for Credits and Grants Under the Qualifying Therapeutic Discovery Project program filed under the Patient Protection and Affordable Care Act of 2010 for the 2009 and 2010 tax years. The examination commenced on September 30, 2011 and as of the date of this filing was still ongoing. The IRS expanded its scope to include the fiscal year 2011 tax return, which was filed in January 2012. Based on the examination to date, the Company does not believe that the results of this examination will have a material effect on its financial statements for any period under examination and that the Company has a sufficient Net Operating Loss carry forward that will offset any adjustment.

Grant Income

9 Months Ended

Jan. 31, 2012

Note 10. Grant Income

In October 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 related to the 2010 expenditures. As of January 31, 2012, $0.5 million related to the 2011 expenditures was still outstanding. The Company received this payment on February 13, 2012.

On August 8, 2011 the Company was notified that it was selected for a tax examination by the Internal Revenue Service (IRS) on the Application for Certification of Qualified Investments Eligible for Credits and Grants Under the Qualifying Therapeutic Discovery Project program filed under the Patient Protection and Affordable Care Act of 2010 for the 2009 and 2010 tax years. The examination commenced on September 30, 2011 and as of the date of this filing was still ongoing.

The IRS expanded its scope to include the fiscal year 2011 tax return, which was filed in January 2012. Based on the examination to date, the Company does not believe that the results of this examination will have a material effect on its financial statements for any period under examination and that the Company has a sufficient Net Operating Loss carry forward that will offset any adjustment.