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Summary of Significant Accounting Policies (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023	Apr. 30, 2023
Product Information [Line Items]
Cash and cash equivalents	$ 4,720,000		$ 4,720,000		$ 6,883,000
Short term investments	4,377,000		4,377,000		$ 27,790,000
Accretion of discount and amortization of premium on investments	100,000	$ 100,000	300,000	$ (200,000)
Share-based compensation expense	100,000	300,000	803,000	$ 911,000
Revenue remaining performance obligation	3,300,000		$ 3,300,000
Expects to recognize revenue remaining performance obligation, percentage			63.00%
Expects to recognize revenue remaining performance obligation	2,100,000		$ 2,100,000
Antidilutive securities excluded from computation of earnings per share, amount			6,094,714	8,010,373
Product development expense	$ 1,500,000	$ 2,000,000.0	$ 5,500,000	$ 6,700,000
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	$ 1,400,000		$ 2,600,000
Transferred over Time [Member]
Product Information [Line Items]
Revenue related to performance obligations	$ 400,000		$ 1,400,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Product Information [Line Items]
Concentration risk percentage			36.00%	28.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Five Customers [Member]
Product Information [Line Items]
Concentration risk percentage	85.00%	63.00%
Santander Bank [Member]
Product Information [Line Items]
Deposits	$ 154,000		$ 154,000

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