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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Deferred tax assets:    
Accrued employee benefit expenses $ 228 $ 296
Allowance for doubtful accounts 142 154
Deferred compensation 1,196 1,283
Tax credits (state, net of federal benefits) 170 978
Foreign tax credit carryforwards 638 638
Unrecognized actuarial loss, defined benefit plans 1,202 1,196
Inventory reserves 62 69
Net operating loss carryforwards 112 572
Proceeds on Sale Leaseback 7,215 0
Other 497 568
Total deferred tax assets 11,462 5,754
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (1,758) (1,596)
Book basis in excess of tax basis of Sale Leaseback property (1,122) 0
Prepaid pension (949) (847)
APB 23 Assertion (976) (765)
Debt Issuance Cost on Sale Leaseback (184) 0
Other 0 (122)
Total deferred tax liabilities (4,989) (3,330)
Valuation allowance (6,901) (2,731)
Net deferred tax liabilities (428) (307)
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax labilities (428) (307)
Net deferred tax liabilities (428) (307)
Non-current    
Deferred tax assets (liabilities) classified in the balance sheet:    
Deferred tax labilities $ (428) $ (307)