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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2020	May 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors' fees paid with shares of common stock in lieu of cash in accordance with Director compensation guidelines					$ 41,000	$ 41,000
2017 Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares)	83,816	12,045
Vesting period (in years)					3 years
Stock-based compensation expense			$ 129,000	$ 126,000	$ 344,000	$ 208,000
Remaining estimated compensation expense			$ 805,000		$ 805,000

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans).

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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