3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative 2)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Options ESPP Warrants
Shares which would have dilutive effect if the entity had not been in a loss position	3,387,483	50,577	3,500,609	87,083
Options and Warrants
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	6,053,421	5,971,867	6,044,158	6,046,536