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Summary of Significant Accounting Policies (Details Narrative) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Apr. 30, 2023	Aug. 31, 2020
Product Information [Line Items]
Cash and cash equivalents	$ 3,292,000		$ 3,292,000		$ 6,883,000
Short term investments	15,427,000		15,427,000		$ 27,790,000
Accretion of discount and amortization of premium on investments	100,000	$ 60,000.00	200,000	$ (200,000)
Accretion of discount and amortization of premium on investments	(100,000)	(60,000.00)	(200,000)	200,000
Share-based compensation expense	300,000	300,000	673,000	632,000
Revenue related to performance obligations satisfied over-time			762,000	$ 129,000
Revenue remaining performance obligation	4,500,000		$ 4,500,000
Expects to recognize revenue remaining performance obligation, percentage			70.00%
Expects to recognize revenue remaining performance obligation	3,200,000		$ 3,200,000
Antidilutive securities excluded from computation of earnings per share, amount			7,294,852	6,242,465
Product development expense	$ 2,100,000	$ 2,300,000	$ 4,000,000.0	$ 4,700,000
Patents [Member]
Product Information [Line Items]
Intangible asset estimated lives	20 years		20 years
Trade Names [Member]
Product Information [Line Items]
Intangible asset estimated lives	12 years		12 years
Customer Relationships [Member]
Product Information [Line Items]
Intangible asset estimated lives	10 years		10 years
Transferred at Point in Time [Member]
Product Information [Line Items]
Revenue related to performance obligations satisfied over-time	$ 500,000		$ 1,200,000
Transferred over Time [Member]
Product Information [Line Items]
Revenue related to performance obligations satisfied over-time	$ 400,000		$ 900,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three Customers [Member]
Product Information [Line Items]
Concentration risk percentage			55.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Four Customers [Member]
Product Information [Line Items]
Concentration risk percentage	71.00%			69.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Five Customers [Member]
Product Information [Line Items]
Concentration risk percentage		80.00%
Santander Bank [Member]
Product Information [Line Items]
Deposits	$ 156,000		$ 156,000
Santander Bank [Member] | January 2024 [Member]
Product Information [Line Items]
Letters of credit issued amount						$ 65,000

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