UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ 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	206			206
Net loss	(319)				(319)
Ending balance (in shares) at Jul. 31, 2022		13,522,441
Ending balance (in shares) at Jul. 31, 2022			0
Ending balance at Jul. 31, 2022	$ 8,983	$ 14	$ 0	81,270	(72,301)
Beginning balance (in shares) at Apr. 30, 2023	13,544,228	13,544,228
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	423			423
Issuance of common stock on exercise of stock options (in shares)		40,897
Issuance of common stock on exercise of stock options	12			12
Repurchase of common stock (in shares)		(101,015)	101,015
Repurchase of common stock	(602)		$ (602)
Net loss	$ (2,566)				(2,566)
Ending balance (in shares) at Jul. 31, 2023	13,484,110	13,484,110
Ending balance (in shares) at Jul. 31, 2023			115,437
Ending balance at Jul. 31, 2023	$ 1,903	$ 14	$ (676)	$ 82,448	$ (79,883)