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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - 6 months ended Nov. 30, 2020 - USD ($)
Series A Preferred Stock [Member]
5% Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balances at May. 31, 2020 $ 25,714 $ 939,205 $ 35,213,707 $ (39,841) $ (21,925,732) $ 14,213,053
Balances (in Shares) at May. 31, 2020 321,429 11,740,089        
Exercise of stock options   $ 2,400 46,930     49,330
Exercise of stock options (in Shares)   30,000        
Foreign currency translation       (3,250)   (3,250)
Compensation expense in connection with options granted     24,227     24,227
Net loss         (3,134,579) (3,134,579)
Balances at Nov. 30, 2020 $ 25,714 $ 941,605 $ 35,284,864 $ (43,091) $ (25,060,311) $ 11,148,781
Balances (in Shares) at Nov. 30, 2020 321,429 11,770,089