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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 30, 2015
Deferred tax assets:    
Accrued employee benefit expenses $ 529 $ 535
Allowance for doubtful accounts 74 53
Deferred compensation 1,753 1,573
Tax credits 224 237
Unrecognized actuarial loss, defined benefit plans 3,850 4,206
Inventory Reserves 118 0
Other 353 354
Total deferred tax assets 6,901 6,958
Deferred tax liabilities:    
Book basis in excess of tax basis of property, plant and equipment (1,655) (1,594)
Prepaid pension (1,854) (2,164)
Other   134
Total deferred tax liabilities (3,509) (3,624)
Less: valuation allowance   (10)
Net deferred tax assets (liabilities) 3,392 3,324
Deferred tax assets classified in the balance sheet:    
Current   856
Non-current 3,392 2,468
Net deferred tax assets (liabilities) $ 3,392 $ 3,324