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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2025
Apr. 30, 2024
Deferred tax assets:    
Accrued employee benefit expenses $ 417 $ 152
Allowance for credit losses 151 151
Deferred compensation 1,345 950
Tax credits (state, net of federal benefits) 170 170
Foreign tax credit carryforwards 638 638
Section 174 R&E 3,269 2,303
Warranty Accrual 193 0
Unrecognized actuarial loss, defined benefit plans   0
Inventory reserves and capitalized costs 478 296
Net operating loss carryforwards 147 152
Proceeds on sale leaseback 6,550 6,316
Operating lease liabilities 2,372 1,211
Other 457 332
Total deferred tax assets 16,187 12,671
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (3,024) (1,678)
Book basis in excess of tax basis of sale leaseback property (1,095) (1,028)
Book basis in excess of tax basis of intangibles assets (4,005) 0
APB 23 Assertion (1,507) (1,572)
Right of use assets (2,589) (1,142)
Debt Issuance Cost on sale leaseback (138) (142)
Total deferred tax liabilities (12,358) (5,562)
Valuation allowance (933) (926)
Net deferred tax assets (liabilities) 2,896 6,183
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax assets, non-current 3,994 7,401
Deferred tax liabilities, non-current (1,098) (1,218)
Net deferred tax assets (liabilities) $ 2,896 $ 6,183