6. Net Loss per Common Share (Details - Antidilutive shares) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Dilutive effect of shares on diluted shares outstanding	275	307	202	226
Stock Options
Dilutive effect of shares on diluted shares outstanding	197	235	133	186
RSUs [Member]
Dilutive effect of shares on diluted shares outstanding	66	56	63	31
Employee Stock Purchase Plan [Member]
Dilutive effect of shares on diluted shares outstanding	12	16	6	9