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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Income Statement [Abstract]    
Net sales $ 1,713,000 $ 1,637,000
Cost of sales (1,301,000) (1,692,000)
Gross profit (loss) 412,000 (55,000)
Operating expenses:    
Selling, general and administrative 1,172,000 1,654,000
Research and development 472,000 361,000
Total operating expenses 1,644,000 2,015,000
Loss from operations (1,232,000) (2,070,000)
Other income:    
Interest and dividend income 123,000
Total other income 123,000
Loss before income taxes (1,109,000) (2,070,000)
Provision for income taxes (23,000) (2,000)
Net loss $ (1,132,000) $ (2,072,000)
Basic net loss per common share $ (0.07) $ (0.16)
Diluted net loss per common share $ (0.07) $ (0.16)
Weighted average number of common and    
Basic 16,821,646 13,100,407
Diluted 16,821,646 13,100,407
Other comprehensive income (loss), net of tax:    
Foreign currency translation $ 6,000 $ (13,000)
Comprehensive loss $ (1,126,000) $ (2,085,000)