7. Net Income (Loss) per Common Share (Details - Reconcilation of per share) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 4,730	$ (3,164)
Series E preferred stock accumulated dividends	(1,442)	(1,442)
Net income (loss) attributable to common stockholders	$ 3,288	$ (4,606)
Weighted average common shares outstanding, basic	56,523	56,167
Stock options	264	0
RSUs	101	0
ESPP	4	0
Weighted average common shares outstanding, dilutive	56,892	56,167
Net income (loss) per share, basic	$ 0.06	$ (0.08)
Net income (loss) per share, diluted	$ 0.06	$ (0.08)