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Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Income Statement [Abstract]
Revenues	$ 169	$ 202
Cost of revenues	334	367
Gross loss	(165)	(165)
Operating expenses:
Engineering and product development costs	1,252	1,198
Selling, general and administrative costs	1,987	1,697
Total operating expenses	3,239	2,895
Operating loss	(3,404)	(3,060)
Gain due to the change in fair value of warrant liabilities		6
Interest income, net	11	42
Foreign exchange gain/(loss)	8	(13)
Net loss	$ (3,385)	$ (3,025)
Basic and diluted net loss per share	$ (0.22)	$ (0.50)
Weighted average shares used to compute basic and diluted net loss per share	15,677,331	6,040,466

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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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

X

- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

+ Details

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