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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2026
Apr. 30, 2025
Deferred tax assets:    
Accrued employee benefit expenses $ 449 $ 417
Allowance for credit losses 160 151
Deferred compensation 1,925 1,345
Tax credits (state, net of federal benefits) 256 170
Foreign tax credit carryforwards 638 638
Section 174 R&E 1,892 3,269
Warranty Accrual 210 193
Inventory reserves and capitalized costs 593 478
Net operating loss carryforwards 169 147
Proceeds on sale leaseback 6,431 6,550
Operating lease liabilities 2,076 2,372
Other 451 457
Total deferred tax assets 15,250 16,187
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (2,969) (3,024)
Book basis in excess of tax basis of sale leaseback property (1,108) (1,095)
Book basis in excess of tax basis of intangibles assets (3,758) (4,005)
APB 23 Assertion (1,376) (1,507)
Right of use assets (2,229) (2,589)
Debt Issuance Cost on sale leaseback (126) (138)
Total deferred tax liabilities (11,566) (12,358)
Valuation allowance (768) (933)
Net deferred tax assets (liabilities) 2,916 2,896
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax assets, non-current 3,829 3,994
Deferred tax liabilities, non-current (913) (1,098)
Net deferred tax assets (liabilities) $ 2,916 $ 2,896