Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	May 31, 2024	May 31, 2023
Income Statement [Abstract]
Net sales	$ 5,415,000	$ 5,339,000
Cost of sales	(4,804,000)	(4,893,000)
Gross profit	611,000	446,000
Operating expenses:
Selling, general and administrative	5,487,000	6,085,000
Research and development	1,491,000	1,584,000
Total operating expense	6,978,000	7,669,000
Loss from operations	(6,367,000)	(7,223,000)
Other income:
Dividend and interest income	431,000	133,000
Other income		1,000
Total other income	431,000	134,000
Loss before income taxes	(5,936,000)	(7,089,000)
Provision for income taxes	(42,000)	(51,000)
Net loss	$ (5,978,000)	$ (7,140,000)
Basic net loss per common share	$ (0.36)	$ (0.50)
Diluted net loss per common share	$ (0.36)	$ (0.50)
Weighted average number of common and common equivalent shares:
Basic	16,821,646	14,154,269
Diluted	16,821,646	14,154,269
Net loss	$ (5,978,000)	$ (7,140,000)
Other comprehensive loss, net of tax:
Foreign currency translation	8,000	(36,000)
Comprehensive loss	$ (5,970,000)	$ (7,176,000)