Consolidated Statements Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at May. 31, 2022	$ 1,029,000	$ 42,447,000	$ (74,000)	$ (35,077,000)	$ 8,325,000
Balance, shares at May. 31, 2022	12,867,924
Exercise of stock options	$ 4,000	77,000			$ 81,000
Exercise of stock options, shares	46,500				46,500
Net proceeds from ATM	$ 46,000	1,915,000			$ 1,961,000
Net proceeds from ATM, shares	573,889
Shares issued in connection with public offering	$ 267,000	7,081,000			7,348,000
Shares issued in connection with public offering, shares	3,333,333
Foreign currency translation			(36,000)		(36,000)
Compensation expense in connection with options granted		1,185,000			1,185,000
Net loss				(7,140,000)	(7,140,000)
Balance at May. 31, 2023	$ 1,346,000	52,705,000	(110,000)	(42,217,000)	11,724,000
Balance, shares at May. 31, 2023	16,821,646
Foreign currency translation			8,000		8,000
Compensation expense in connection with options granted		837,000			837,000
Net loss				(5,978,000)	(5,978,000)
Balance at May. 31, 2024	$ 1,346,000	$ 53,542,000	$ (102,000)	$ (48,195,000)	$ 6,591,000
Balance, shares at May. 31, 2024	16,821,646