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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Income Tax Disclosure [Abstract] |  |
Income tax expense at statutory rate | $ 547 | $ 2,864
State and local taxes, net of federal income tax benefit (expense) | (29) | 162
Tax credits (state, net of federal benefit) | (546) | (370)
Effects of differing US and foreign tax rates | 190 | (97)
Rate reduction impact on deferred tax assets | 75 | 680
Federal and state transition tax on unrepatriated foreign earnings | 0 | 649
Effects of stock options exercised | (49) | 0
Effect of prior year true ups | (105) | 0
Impact of foreign subsidiary income to parent | 317 | 0
Increase (decrease) in valuation allowance | 7 | 175
Other items, net | 39 | 98
Net income tax expense | $ 446 | $ 4,161

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