UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (DEFICIENCY) - 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, 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]
Net loss	(2,774)
Ending balance (in shares) at Jan. 31, 2023		13,558,650
Ending balance (in shares) at Jan. 31, 2023			0
Ending balance at Jan. 31, 2023	7,064	$ 14	$ 0	81,806	(74,756)
Beginning balance (in shares) at Jul. 31, 2022		13,522,441
Beginning balance (in shares) at Jul. 31, 2022			0
Beginning balance at Jul. 31, 2022	8,983	$ 14	$ 0	81,270	(72,301)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	119			119
Issuance of common stock on exercise of stock options (in shares)		36,209
Issuance of common stock on exercise of stock options	86			86
Net loss	(16)				(16)
Ending balance (in shares) at Oct. 31, 2022		13,558,650
Ending balance (in shares) at Oct. 31, 2022			0
Ending balance at Oct. 31, 2022	9,172	$ 14	$ 0	81,475	(72,317)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	331			331
Net loss	(2,439)				(2,439)
Ending balance (in shares) at Jan. 31, 2023		13,558,650
Ending balance (in shares) at Jan. 31, 2023			0
Ending balance at Jan. 31, 2023	$ 7,064	$ 14	$ 0	81,806	(74,756)
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
Ending balance (in shares) at Jul. 31, 2023			115,437
Ending balance at Jul. 31, 2023	$ 1,903	$ 14	$ (676)	82,448	(79,883)
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]
Net loss	$ (7,167)
Ending balance (in shares) at Jan. 31, 2024	13,593,766	13,593,766
Ending balance (in shares) at Jan. 31, 2024			120,333
Ending balance at Jan. 31, 2024	$ (2,058)	$ 14	$ (708)	83,120	(84,484)
Beginning balance (in shares) at Jul. 31, 2023		13,484,110
Beginning balance (in shares) at Jul. 31, 2023			115,437
Beginning balance at Jul. 31, 2023	1,903	$ 14	$ (676)	82,448	(79,883)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	53			53
Issuance of common stock on exercise of stock options (in shares)		114,552
Issuance of common stock on exercise of stock options	240			240
Repurchase of common stock (in shares)		4,896	4,896
Repurchase of common stock	(32)		$ (32)
Net loss	(2,071)				(2,071)
Ending balance (in shares) at Oct. 31, 2023		13,593,766
Ending balance (in shares) at Oct. 31, 2023			120,333
Ending balance at Oct. 31, 2023	93	$ 14	$ (708)	82,741	(81,954)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	379			379
Net loss	$ (2,530)				(2,530)
Ending balance (in shares) at Jan. 31, 2024	13,593,766	13,593,766
Ending balance (in shares) at Jan. 31, 2024			120,333
Ending balance at Jan. 31, 2024	$ (2,058)	$ 14	$ (708)	$ 83,120	$ (84,484)