2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Antidilutive If-Converted) - shares	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	43,878,138	32,757,851	42,637,136	29,291,745
Stock Options [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	29,806,420	19,235,713	28,834,459	15,775,106
Warrants [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	273,280	273,280	273,280	273,280
Series E Preferred Stock [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	13,798,438	13,248,858	13,529,397	13,243,359