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Income Taxes - Summary of Reconciliation of Provision from Income Taxes from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	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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