Stock-based Payments - Narrative (Details) - USD ($)			12 Months Ended			25 Months Ended
	Dec. 12, 2013	Feb. 18, 2011	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2021	Apr. 30, 2025	Mar. 29, 2023	Mar. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense			$ 654,000	$ 1,118,000
Grants in period, weighted average grant date fair value (in dollars per share)			$ 2.86	$ 3.75
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				$ 634,000		$ 708,000
Remaining repurchase amount			$ 4,300,000			4,300,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock approximate value						$ 0
Equity Incentive Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)			1,200,000			1,200,000
Expiration term of awards			10 years
Strike price as percent of market value			100.00%
Equity Incentive Plan 2021 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)					2,000,000
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
Vesting period					1 year
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