9. NET LOSS PER COMMON SHARE (Details - Antidilutive shares) - shares	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Options [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	234,763	31,877	185,996	69,065
Restricted stock rights [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	55,963	0	30,645	0
ESPP [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	16,401	0	9,090	133
Options, RSRs and ESPP [Member]
Antidilutive shares excluded from calculation of weighted average diluted shares outstanding	307,127	31,877	225,731	69,198