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Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Income Statement [Abstract]
Revenues	$ 272	$ 169
Cost of revenues	423	334
Gross loss	(151)	(165)
Operating expenses:
Engineering and product development costs	1,971	1,252
Selling, general and administrative costs	2,909	1,987
Total operating expenses	4,880	3,239
Operating loss	(5,031)	(3,404)
Interest income, net	20	11
Gain on extinguishment of PPP loan	891
Foreign exchange gain		8
Loss before income taxes	(4,120)	(3,385)
Income tax benefit	1,041
Net loss	$ (3,079)	$ (3,385)
Basic and diluted net loss per share	$ (0.06)	$ (0.22)
Weighted average shares used to compute basic and diluted net loss per share	52,458,011	15,677,331

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