Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023	Apr. 30, 2024
Accounting Policies [Abstract]
Working capital deficit	$ 4,800,000		$ 4,800,000
Accumulated deficit	82,552,000		82,552,000		$ 84,593,000
Unrecognized tax benefits	181,000		181,000		$ 181,000
Income tax penalties and interest expense	0	$ 0	0	$ 0
Unrecognized tax benefits anticipated during the next 12 months	0		0
Provision for income taxes	$ 11,000	$ 11,000	$ 31,000	$ 39,000