CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ (DEFICIENCY) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Apr. 30, 2022		13,522,441
Beginning balance (in shares) at Apr. 30, 2022			0
Beginning balance at Apr. 30, 2022	$ 9,096	$ 14	$ 0	$ 81,064	$ (71,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	864			864
Issuance of common stock on exercise of stock options (in shares)		36,209
Issuance of common stock on exercise of stock options	85	$ 0		85
Repurchase of common stock (in shares)		0	14,422
Repurchase of common stock	(74)		$ (74)
Net loss	$ (5,335)				(5,335)
Ending balance (in shares) at Apr. 30, 2023	13,544,228	13,558,650
Ending balance (in shares) at Apr. 30, 2023			14,422
Ending balance at Apr. 30, 2023	$ 4,636	$ 14	$ (74)	82,013	(77,317)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1,118			1,118
Issuance of common stock on exercise of stock options (in shares)		155,449
Issuance of common stock on exercise of stock options	253	$ 0		253
Repurchase of common stock (in shares)		0	105,911
Repurchase of common stock	(634)		$ (634)
Net loss	$ (7,276)				(7,276)
Ending balance (in shares) at Apr. 30, 2024	13,558,650	13,714,099
Ending balance (in shares) at Apr. 30, 2024			120,333
Ending balance at Apr. 30, 2024	$ (1,903)	$ 14	$ (708)	$ 83,384	$ (84,593)