INTEREST INCOME,NET (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 31, 2020	Jul. 31, 2019
INTEREST INCOME, NET
Interest income on savings	$ 6	$ 60
Interest on deferred purchase price	0	64
Interest income, net	$ 6	$ 124

Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.4)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration