2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Antidilutive shares, conversion price) - If Converted Method [Member] - shares	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Stock Options [Member]
Dilutive effect of shares on diluted shares outstanding	3,636,699	4,156,421	2,740,922
Warrants
Dilutive effect of shares on diluted shares outstanding	39,040	39,040	39,040
Series E Preferred Stock [Member]
Dilutive effect of shares on diluted shares outstanding	1,978,783	1,955,588	1,893,122
Option, Warrants, Series E Preferred Stock [Member]
Dilutive effect of shares on diluted shares outstanding	5,654,522	6,151,049	4,673,084