8. NET LOSS PER COMMON SHARE (Details - Antidilutive shares) - shares	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Options [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	116,962	115,425	160,937	78,427
Restricted Stock Units RSUs [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	38,466	0	33,606	0
ESPP [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	86	1,202	9,773	466
Options, RSUs and ESPP [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	155,514	116,627	204,316	78,893