Consolidated Statements of Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at May. 31, 2021	$ 985,000	$ 38,837,000	$ (48,000)	$ (30,546,000)	$ 9,228,000
Balance, shares at May. 31, 2021	12,307,157
Exercise of stock options	$ 3,000	74,000			$ 77,000
Exercise of stock options, shares	39,500				39,500
Net proceeds from ATM	$ 41,000	2,276,000			$ 2,317,000
Net proceeds from ATM, shares	521,267
Foreign currency translation			(26,000)		(26,000)
Share-based compensation		1,260,000			1,260,000
Net loss				(4,531,000)	(4,531,000)
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
Foreign currency translation			(36,000)		(36,000)
Share-based compensation		1,185,000			1,185,000
Net loss				(7,140,000)	(7,140,000)
Shares issued in connection with public offering, net of offering costs	$ 267,000	7,081,000			7,348,000
Shares issued in connection with public offering, net of offering costs, shares	3,333,333
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