Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Effective income tax rate	32.00%	30.00%	22.00%
Tax benefits realized from the recognition of stock option deductions	$ 253,000	$ 247,000	$ 420,000
Unrecognized tax benefits that, if recognized, would impact effective tax rate	57,000	101,000	115,000
Income tax benefit due to reversal of reserve for uncertain tax positions			973,000
Liability for potential penalties and interest	24,000	47,000
Research and development state tax credits	520,000	694,000	$ 516,000
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Operating loss carryforwards	$ 9,000,000
Operating loss carryforwards expiration year	2035
Research and development state tax credits	$ 436,000	$ 1,300,000

Income Tax Disclosure [Line Items]

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Operating Loss Carryforwards, Expiration Year

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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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 research tax credit.

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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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