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Percentage of stock vested for share based compensation arrangement by share based payment award options during the period.

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Share-based Compensation Arrangement by Share-based Payment Award, Term of Option to Purchase

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Number of shares to purchase common stock option awards during the reporting period.

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Number of shares to purchase of unregistered common stock option awards during the reporting period.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stock-based Payments - Narrative (Details) - USD ($)			12 Months Ended
Stock-based Payments - Narrative (Details) - USD ($)	Dec. 12, 2013	Feb. 18, 2011	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Mar. 29, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 864,000	$ 912,000
Stock options award shares to purchase common stock (in shares)	16,667
Grants in period, weighted average grant date fair value (in dollars per share)			$ 4.31	$ 5.56
Share repurchase program, authorized amount						$ 5,000,000
Treasury stock (in shares)			14,000
Treasury stock average price (in dollars per share)			$ 5.11
Treasury stock approximate value			$ 74,000
Remaining repurchase amount			$ 4,900,000
Equity Incentive Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)			1,700,000		2,000,000
Expiration term of awards			10 years
Strike price as percent of market value			100.00%
Equity Incentive Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term of awards			10 years
Strike price as percent of market value			100.00%
Equity Incentive Plan 2010 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, net of forfeitures (in shares)		30,000,000
2008 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term of awards			10 years
Director Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options award shares to purchase common stock (in shares)	8,333
Stock option award shares to purchase unregistered common stock (in shares)	1,667
Vested percent	25.00%
Director Compensation Plan \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual base compensation mount					$ 100,000
Director Compensation Plan \| Board of Directors Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of option to purchase	5 years
Annual base compensation mount					150,000
Director Compensation Plan \| Maximum \| Director \| Options and Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual base compensation mount					35,000
Director Compensation Plan \| Maximum \| Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual base compensation mount					120,000
Director Compensation Plan \| Minimum \| Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual base compensation mount					$ 110,000