7. Net Income (Loss) per Common Share (Details - Antidilutive shares) - shares shares in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Dilutive effect of shares on diluted shares outstanding	4,091	5,034
Stock Options
Dilutive effect of shares on diluted shares outstanding	2,064	2,965
RSUs [Member]
Dilutive effect of shares on diluted shares outstanding	48	88
ESPP [Member]
Dilutive effect of shares on diluted shares outstanding	0	2
Series E Preferred Stock [Member]
Dilutive effect of shares on diluted shares outstanding	1,979	1,979