2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Antidilutive shares) - shares	12 Months Ended
Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Stock Options
Dilutive effect of shares on diluted shares outstanding	53,978	0	252,098
Employee Stock Purchase Plan [Member]
Dilutive effect of shares on diluted shares outstanding	1,972	45,767	37,862
Options and ESPP [Member]
Dilutive effect of shares on diluted shares outstanding	55,950	45,767	289,960

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration