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Income Taxes - Summary of Reconciliation of Provision from Income Taxes from Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
Income Tax Disclosure [Abstract] |  |  |
Federal income taxes expected at the statutory rate | $ 10 | $ (2,587) | $ (2,577)
State income taxes, less federal income tax benefit | 14 | (132) | (303)
Stock compensation | 249 | 436 | 96
Research and development tax credit | (149) | (203) | (200)
Change in deferred tax valuation allowance | (192) | 2,257 | 2,600
Other | 191 | 159 | 135
Total income tax expense/(benefit) | 123 | (70) | (249)
Federal operating loss carryforward tax benefit | 875 | 875 | 875
State operating loss carryforward tax benefit | $ 95 | $ 95 | $ 95

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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