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Grant Income	12 Months Ended
Apr. 30, 2012
Grant Income [Abstract]
Grant Income [Text Block]	Note 13. 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. The Company received a final payment of $0.5 million related to 2011 expenditures 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 during the second quarter of fiscal 2012. The IRS expanded its scope to include the fiscal year 2011 tax return, which was filed in January 2012. The examinations of fiscal 2009 and 2010 were completed in the fourth quarter of fiscal 2012. The examination of fiscal 2011 completed in the first quarter of fiscal 2013. The audit of all three fiscal years (2009, 2010, and 2011) resulted in no additional tax due or receivable.

Grant Income

12 Months Ended

Apr. 30, 2012

Note 13. 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. The Company received a final payment of $0.5 million related to 2011 expenditures 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 during the second quarter of fiscal 2012.

The IRS expanded its scope to include the fiscal year 2011 tax return, which was filed in January 2012. The examinations of fiscal 2009 and 2010 were completed in the fourth quarter of fiscal 2012. The examination of fiscal 2011 completed in the first quarter of fiscal 2013. The audit of all three fiscal years (2009, 2010, and 2011) resulted in no additional tax due or receivable.