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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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