Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Apr. 30, 2024
Accounting Policies [Abstract]
Net income (loss)	$ 1,313,000	$ (2,566,000)	$ (7,300,000)
Net cash (used in) provided by operating activities	311,000	(3,991,000)	(6,100,000)
Working capital deficit	6,000,000.0
Accumulated deficit	83,280,000		84,593,000
Unrecognized tax benefits	181,000		$ 181,000
Income tax penalties and interest expense	0	0
Unrecognized tax benefits anticipated during the next 12 months	0
Provision for income taxes	$ 21,000	$ 28,000