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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Apr. 30, 2019
Apr. 30, 2018
Deferred tax assets:    
Accrued employee benefit expenses $ 466,000 $ 418,000
Allowance for doubtful accounts 28,000 41,000
Deferred compensation 922,000 1,205,000
Tax credits (state, net of federal benefits) 434,000 221,000
Foreign tax credit carryforwards 638,321 0
Unrecognized actuarial loss, defined benefit plans 1,772,000 1,825,000
Inventory reserves 290,000 378,000
Net operating loss carryforwards 257,000 261,000
Revenue recognition (31,000) 0
LIFO change (156,000) (162,000)
Other 183,000 79,000
Total deferred tax assets 4,803,000 4,266,000
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (850,000) (1,043,000)
Prepaid pension (1,218,000) (1,093,000)
Total deferred tax liabilities (2,068,000) (2,136,000)
Less: valuation allowance (906,000) (261,000)
Net deferred tax assets 1,829,000 1,869,000
Deferred tax assets classified in the balance sheet:    
Non-current 1,829,000 1,869,000
Net deferred tax assets $ 1,829,000 $ 1,869,000