6. Net Loss per Common Share (Details - Antidilutive shares) - shares shares in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Dilutive effect of shares on diluted shares outstanding	155	112
Stock Options
Dilutive effect of shares on diluted shares outstanding	107	102
RSUs [Member]
Dilutive effect of shares on diluted shares outstanding	46	7
Employee Stock Purchase Plan [Member]
Dilutive effect of shares on diluted shares outstanding	2	3