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Income Taxes - Summary of Deferred Tax Assets (Liabilities) Related to Temporary Differences (Details) - USD ($)
$ in Thousands
Apr. 30, 2025
Apr. 30, 2024
Income Tax Disclosure [Abstract]    
Inventories $ 1,321 $ 1,100
Accrued expenses, including compensation 2,261 1,589
Workers' compensation 13 10
Warranty reserve 322 286
Stock-based compensation 991 1,066
State bonus depreciation 56 110
Property, plant, and equipment (1,974) (2,619)
Intangible assets 11,059 11,777
Right-of Use assets (7,401) (7,740)
Right-of Use lease liabilities 7,724 7,985
Capitalized R&D 2,649 2,136
Other (182) (83)
Loss and credit carryforwards 2,267 3,681
Less valuation allowance (19,106) (19,298)
Net deferred tax asset/(liability) - total $ 0 $ 0