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, 2023		13,558,650
Beginning balance (in shares) at Apr. 30, 2023			14,422
Beginning 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			253
Repurchase of common stock (in shares)			105,911
Repurchase of common stock	(634)		$ (634)
Net income (loss)	$ (7,276)				(7,276)
Ending balance (in shares) at Apr. 30, 2024	13,593,766	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	654			654
Issuance of common stock on exercise of stock options (in shares)		183,404
Issuance of common stock on exercise of stock options	320			320
Net income (loss)	$ 4,701				4,701
Ending balance (in shares) at Apr. 30, 2025	13,777,170	13,897,503
Ending balance (in shares) at Apr. 30, 2025			120,333
Ending balance at Apr. 30, 2025	$ 3,772	$ 14	$ (708)	$ 84,358	$ (79,892)