Income Taxes - Additional Information (Detail) - USD ($)	4 Months Ended	8 Months Ended	12 Months Ended
Apr. 30, 2018	Dec. 22, 2017	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	21.00%	35.00%	30.30%	35.00%	35.00%
Effective income tax rate			23.00%	32.00%	30.00%
Tax benefits realized from the recognition of stock option deductions			$ 186,000	$ 253,000	$ 247,000
Unrecognized tax benefits that, if recognized, would impact effective tax rate	$ 56,000		56,000	57,000	101,000
Liability for potential penalties and interest	24,000		24,000	24,000
Research and development state tax credits			493,000	520,000	$ 694,000
Benefit from impact of changes in tax rate			(1,206,000)
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Operating loss carryforwards	$ 5,700,000		$ 5,700,000
Operating loss carryforwards expiration year			2035
Research and development state tax credits			$ 290,000	$ 436,000

Income Tax Disclosure [Line Items]

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Operating Loss Carryforwards, Expiration Year

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Provision for income tax realized from stock options exercised.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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