Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Income Statement [Abstract]
Net sales	$ 1,380,000	$ 1,807,000
Cost of sales	(956,000)	(1,518,000)
Gross profit	424,000	289,000
Operating expenses:
Selling, general and administrative	1,330,000	1,360,000
Research and development	212,000	297,000
Total operating expense	1,542,000	1,657,000
Loss from operations	(1,118,000)	(1,368,000)
Other income:
Dividend, interest, and other income	1,123,000	56,000
Total other income	1,123,000	56,000
Income (loss) before income taxes	5,000	(1,312,000)
Provision for income taxes	(3,000)	(4,000)
Net income (loss)	$ 2,000	$ (1,316,000)
Basic net income (loss) per common share	$ 0.00	$ (0.63)
Diluted net income (loss) per common share	$ 0.00	$ (0.63)
Weighted average number of common and common equivalent shares:
Basic	2,638,699	2,103,154
Diluted	2,638,699	2,103,154
Other comprehensive income (loss), net of tax:
Foreign currency translation	$ 2,000	$ (6,000)
Comprehensive income (loss)	$ 4,000	$ (1,322,000)