2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (USD $)	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Gross proceeds from stock issuance			$ 24,277,000
Options ESPP Warrants
Shares which would have dilutive effect if the entity had not been in a loss position	3,700,172	4,824,231	4,041,090	3,472,288
Options and Warrants
Shares which would have dilutive effect if the entity had not been in a loss position	9,832,939	4,884,707	6,025,221	5,728,569