2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Antidilutive shares, conversion price) - shares	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Dilutive effect of shares on diluted shares outstanding	2,029,713	3,880,185	4,652,810
Conversion Price greater than Market Price [Member]
Dilutive effect of shares on diluted shares outstanding	32,711,583	18,623,816	6,678,255
Stock Options
Dilutive effect of shares on diluted shares outstanding	1,764,684	3,833,193	4,576,112
Stock Options | Conversion Price greater than Market Price [Member]
Dilutive effect of shares on diluted shares outstanding	19,186,454	8,471,005	5,151,523
Warrants
Dilutive effect of shares on diluted shares outstanding	0	0	3,802
Warrants | Conversion Price greater than Market Price [Member]
Dilutive effect of shares on diluted shares outstanding	273,280	273,280	273,280
Series E Preferred Stock [Member] | Conversion Price greater than Market Price [Member]
Dilutive effect of shares on diluted shares outstanding	13,251,849	9,879,531	1,253,452