Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	May 31, 2025	May 31, 2024
Income Statement [Abstract]
Net sales	$ 5,311,000	$ 5,415,000
Cost of sales	(4,813,000)	(4,804,000)
Gross profit	498,000	611,000
Operating expenses:
Selling, general and administrative	4,612,000	5,487,000
Research and development	1,023,000	1,491,000
Total operating expense	5,635,000	6,978,000
Loss from operations	(5,137,000)	(6,367,000)
Other income:
Dividend and interest income	165,000	431,000
Total other income	165,000	431,000
Loss before income taxes	(4,972,000)	(5,936,000)
Provision for income taxes	(1,000)	(42,000)
Net loss	$ (4,973,000)	$ (5,978,000)
Basic net loss per common share	$ (2.16)	$ (2.84)
Diluted net loss per common share	$ (2.16)	$ (2.84)
Weighted average number of common and common equivalent shares:
Basic	2,297,057	2,103,154
Diluted	2,297,057	2,103,154
Net loss	$ (4,973,000)	$ (5,978,000)
Other comprehensive loss, net of tax:
Foreign currency translation	(3,000)	8,000
Comprehensive loss	$ (4,976,000)	$ (5,970,000)