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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Deferred tax assets:    
Accrued employee benefit expenses $ 153 $ 228
Allowance for doubtful accounts 114 142
Deferred compensation 1,156 1,196
Tax credits (state, net of federal benefits) 170 170
Foreign tax credit carryforwards 638 638
Section 174 R&E Addback 1,558 0
Unrecognized actuarial loss, defined benefit plans 1,064 1,202
Inventory reserves and capitalized costs 201 110
Net operating loss carryforwards 249 112
Proceeds on Sale Leaseback 6,963 7,215
Operating lease liabilities 1,558 0
Other 254 449
Total deferred tax assets 14,078 11,462
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (1,417) (1,758)
Book basis in excess of tax basis of Sale Leaseback property (1,106) (1,122)
Prepaid pension (919) (949)
APB 23 Assertion (1,318) (976)
Right of use assets (1,526) 0
Debt Issuance Cost on Sale Leaseback (167) (184)
Total deferred tax liabilities (6,453) (4,989)
Valuation allowance (8,568) (6,901)
Net deferred tax liabilities (943) (428)
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax labilities (943) (428)
Net deferred tax liabilities (943) (428)
Non-current    
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax labilities $ (943) $ (428)