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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Income Statement [Abstract]        
Net sales $ 1,372,526 $ 1,596,408 $ 2,516,332 $ 2,790,823
Cost of sales (1,011,030) (1,127,536) (1,971,960) (1,954,647)
Gross Profit 361,496 468,872 544,372 836,176
Operating Expenses:        
Selling, general and administrative 1,254,847 553,761 2,419,411 1,060,958
Research and development 586,403 404,854 1,261,096 775,320
Total operating expense 1,841,250 958,615 3,680,507 1,836,278
Loss from operations (1,479,754) (489,743) (3,136,135) (1,000,102)
Other Income:        
Dividend and interest income 7,983 4,488 16,074 8,551
Interest expense (5) (5)
Total other income 7,983 4,483 16,074 8,546
Loss before income taxes (1,471,771) (485,260) (3,120,061) (991,556)
Provision for income taxes 13,393 14,518
Net loss $ (1,485,164) $ (485,260) $ (3,134,579) $ (991,556)
Basic net loss per common share (in Dollars per share) $ (0.13) $ (0.05) $ (0.27) $ (0.10)
Diluted net loss per common share (in Dollars per share) $ (0.13) $ (0.05) $ (0.27) $ (0.10)
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 11,756,265 9,817,363 11,752,299 9,780,813
Diluted (in Shares) 11,756,265 9,817,363 11,752,299 9,780,813
Net loss $ (1,485,164) $ (485,260) $ (3,134,579) $ (991,556)
Other comprehensive loss, net of tax:        
Foreign currency translation (1,530) (1,643) (3,250) (5,085)
Comprehensive loss $ (1,486,694) $ (486,903) $ (3,137,829) $ (996,641)