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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Net sales $ 1,194,415 $ 1,272,870
Cost of sales (827,111) (935,647)
Gross profit 367,304 337,223
Operating Expenses:    
Selling, general and administrative 506,397 400,228
Research and development 370,466 391,781
Total operating expenses 876,863 792,009
Loss from operations (509,559) (454,786)
Other Income (Expense):    
Dividend and interest income 4,063 3,093
Interest expense (47)
Total other income 4,063 3,046
Loss before income tax (505,496) (451,740)
Provision for income taxes 800
Net loss $ (506,296) $ (451,740)
Basic net loss per common share (in Dollars per share) $ (0.05) $ (0.05)
Diluted net loss per common share (in Dollars per share) $ (0.05) $ (0.05)
Weighted average number of common and common equivalent shares:    
Basic (in Shares) 9,744,461 8,930,251
Diluted (in Shares) 9,744,461 8,930,251
Net loss $ (506,296) $ (451,740)
Other comprehensive gain (loss), net of tax:    
Foreign currency translation (3,442) (1,326)
Comprehensive loss $ (509,738) $ (453,066)