2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)	1 Months Ended	6 Months Ended
	Dec. 10, 2015	Oct. 31, 2015	Apr. 30, 2015	Oct. 31, 2014	Apr. 30, 2014
Cash and cash equivalents		$ 72,005,000	$ 68,001,000	$ 64,439,000	$ 77,490,000
Common Stock
Gross proceeds from issuance of equity	$ 4,632,000	$ 36,642,000
Amounts Remaining Under Shelf Agreements	$ 119,213,000
Stock issued subsequent to date, not included in loss per share	3,865,257