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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
May 31, 2023
May 31, 2022
Income Statement [Abstract]    
Net sales $ 5,339,000 $ 18,871,000
Cost of sales (4,893,000) (15,894,000)
Gross profit 446,000 2,977,000
Operating expenses:    
Selling, general and administrative 6,085,000 5,699,000
Research and development 1,584,000 1,812,000
Total operating expense 7,669,000 7,511,000
Loss from operations (7,223,000) (4,534,000)
Other income:    
Dividend and interest income 133,000 27,000
Other income 1,000
Total other income 134,000 27,000
Loss before income taxes (7,089,000) (4,507,000)
Provision for income taxes (51,000) (24,000)
Net loss $ (7,140,000) $ (4,531,000)
Basic net loss per common share $ (0.50) $ (0.36)
Diluted net loss per common share $ (0.50) $ (0.36)
Weighted average number of common and    
Basic 14,154,269 12,673,245
Diluted 14,154,269 12,673,245
Other comprehensive loss, net of tax:    
Foreign currency translation $ (36,000) $ (26,000)
Comprehensive loss $ (7,176,000) $ (4,557,000)