2. Summary of Significant Accounting Policies (Details - Restricted Cash) - USD ($) $ in Thousands	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 30,687	$ 32,351	$ 27,758	$ 42,265
Restricted cash	350	1,150	1,150	1,150
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$ 31,037	$ 33,501	$ 28,908	$ 43,415

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

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