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, 2023		13,544,228
Beginning balance at Apr. 30, 2023	$ 4,636	$ 14	$ (74)	$ 82,013	$ (77,317)
Beginning balance (in shares) at Apr. 30, 2023			14,422
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 income (loss)	(2,566)				(2,566)
Ending balance (in shares) at Jul. 31, 2023		13,484,110
Ending balance at Jul. 31, 2023	1,903	$ 14	$ (676)	82,448	(79,883)
Ending balance (in shares) at Jul. 31, 2023			115,437
Beginning balance (in shares) at Apr. 30, 2023		13,544,228
Beginning balance at Apr. 30, 2023	4,636	$ 14	$ (74)	82,013	(77,317)
Beginning balance (in shares) at Apr. 30, 2023			14,422
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4,637)
Ending balance (in shares) at Oct. 31, 2023		13,593,766
Ending balance at Oct. 31, 2023	93	$ 14	$ (708)	82,741	(81,954)
Ending balance (in shares) at Oct. 31, 2023			120,333
Beginning balance (in shares) at Jul. 31, 2023		13,484,110
Beginning balance at Jul. 31, 2023	1,903	$ 14	$ (676)	82,448	(79,883)
Beginning balance (in shares) at Jul. 31, 2023			115,437
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 income (loss)	(2,071)				(2,071)
Ending balance (in shares) at Oct. 31, 2023		13,593,766
Ending balance at Oct. 31, 2023	$ 93	$ 14	$ (708)	82,741	(81,954)
Ending balance (in shares) at Oct. 31, 2023			120,333
Beginning balance (in shares) at Apr. 30, 2024	13,593,766	13,714,099
Beginning balance at Apr. 30, 2024	$ (1,903)	$ 14	$ (708)	83,384	(84,593)
Beginning balance (in shares) at Apr. 30, 2024			120,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	258			258
Issuance of common stock on exercise of stock options (in shares)		105,137
Issuance of common stock on exercise of stock options	276			276
Net income (loss)	1,313				1,313
Ending balance (in shares) at Jul. 31, 2024		13,714,099
Ending balance at Jul. 31, 2024	$ (332)	$ 14	$ (708)	83,642	(83,280)
Ending balance (in shares) at Jul. 31, 2024			120,333
Beginning balance (in shares) at Apr. 30, 2024	13,593,766	13,714,099
Beginning balance at Apr. 30, 2024	$ (1,903)	$ 14	$ (708)	83,384	(84,593)
Beginning balance (in shares) at Apr. 30, 2024			120,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,041
Ending balance (in shares) at Oct. 31, 2024	13,698,903	13,819,236
Ending balance at Oct. 31, 2024	$ 681	$ 14	$ (708)	83,927	(82,552)
Ending balance (in shares) at Oct. 31, 2024			120,333
Beginning balance (in shares) at Jul. 31, 2024		13,714,099
Beginning balance at Jul. 31, 2024	(332)	$ 14	$ (708)	83,642	(83,280)
Beginning balance (in shares) at Jul. 31, 2024			120,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9			9
Net income (loss)	$ 728				728
Ending balance (in shares) at Oct. 31, 2024	13,698,903	13,819,236
Ending balance at Oct. 31, 2024	$ 681	$ 14	$ (708)	$ 83,927	$ (82,552)
Ending balance (in shares) at Oct. 31, 2024			120,333