6. Net Loss per Common Share (Details - Antidilutive shares, conversion price) - shares shares in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Dilutive effect of shares on diluted shares outstanding	155	112
RSUs [Member]
Dilutive effect of shares on diluted shares outstanding	46	7
If Converted Method [Member]
Dilutive effect of shares on diluted shares outstanding	4,879	4,713
If Converted Method [Member] | Stock Options [Member]
Dilutive effect of shares on diluted shares outstanding	2,858	2,695
If Converted Method [Member] | RSUs [Member]
Dilutive effect of shares on diluted shares outstanding	42	0
If Converted Method [Member] | Warrants
Dilutive effect of shares on diluted shares outstanding	0	39
If Converted Method [Member] | Series E Preferred Stock [Member]
Dilutive effect of shares on diluted shares outstanding	1,979	1,979