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Stockholders' Equity - Share Based Compensation Stock Options Activity (Detail) - $ / shares	6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Shares
Options outstanding, beginning of year, Shares	267,761	316,160
Exercised during the period, Shares	(15,000)	(32,899)
Options outstanding, end of period, Shares	252,761	283,261
Weighted average remaining contractual life	1 year 11 months 19 days	2 years 8 months 26 days
Options exercisable, end of period, Shares	252,761	283,261
Weighted average remaining contractual life	1 year 11 months 19 days	2 years 8 months 26 days
Weighted-Average Exercise Price
Options outstanding, beginning of year, Weighted-Average Exercise Price	$ 6.76	$ 6.69
Exercised during period, Weighted-Average Exercise Price	5.79	6.52
Options outstanding, end of period, Weighted-Average Exercise Price	6.82	6.71
Options exercisable, end of period, Weighted-Average Exercise Price	$ 6.82	$ 6.71

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
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-SubTopic 10
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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