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Stock-based Payments - Narrative (Details) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 12, 2013 | Feb. 18, 2011 | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2021 | Mar. 29, 2023 | Apr. 30, 2022 | Mar. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation expense |  |  | $ 1,118,000 | $ 864,000 |  |  |  |
Grants in period, weighted average grant date fair value (in dollars per share) |  |  | $ 3.75 | $ 4.31 |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  | $ 5,000,000 |  |
Treasury stock (in shares) |  |  | 120,300 |  |  |  |  |
Treasury stock average price (in dollars per share) |  |  | $ 5.73 |  |  |  |  |
Treasury stock approximate value |  |  | $ 708,000 |  |  |  |  |
Remaining repurchase amount |  |  | $ 4,300,000 |  |  |  |  |
Equity Incentive Plan 2021 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) |  |  | 1,300,000 |  |  |  | 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] |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  |  |  |  |  | 0
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 |  |  |  |  |  |
Director Compensation Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested percent | 25.00% |  |  |  |  |  |  |
Director Compensation Plan | Independent Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Term of option to purchase | 5 years |  |  |  | 10 years |  |  |
Stock options award shares to purchase common stock (in shares) | 8,333 |  |  |  |  |  |  |
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 | Chairperson of a Committee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Term of option to purchase | 5 years |  |  |  |  |  |  |
Stock options award shares to purchase common stock (in shares) | 16,667 |  |  |  |  |  |  |
Stock option award shares to purchase unregistered common stock (in shares) | 1,667 |  |  |  |  |  |  |
Director Compensation Plan | Maximum | Independent Directors | Options and Cash |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual base compensation mount |  |  |  |  | 35,000 |  |  |
Director Compensation Plan | Maximum | Chairperson of a Committee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual base compensation mount |  |  |  |  | 120,000 |  |  |
Director Compensation Plan | Minimum | Chairperson of a Committee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual base compensation mount |  |  |  |  | $ 110,000 |  |  |

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