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CONSOLIDATED STATEMENTS OF SHAREHOLDERS` EQUITY - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Subscriptions Receivable [Member]
Total
Balances at May. 31, 2017 $ 680,893 $ 19,551,855 $ (15,834) $ (15,727,790)   $ 4,489,124
Balances (in Shares) at May. 31, 2017 8,511,173          
Exercise of stock options $ 2,780 24,656       27,436
Exercise of stock options (in Shares) 34,750          
Net proceeds from ATM $ 27,367 1,248,566       1,275,933
Net proceeds from ATM (in Shares) 342,088          
Stock subscription receivable         $ (9,062) (9,062)
Foreign currency translation     (10,302)     (10,302)
Compensation expense in connection with options granted   18,473       18,473
Net loss       (1,465,828)   (1,465,828)
Balances at May. 31, 2018 $ 711,040 20,843,550 (26,136) (17,193,618) (9,062) 4,325,774
Balances (in Shares) at May. 31, 2018 8,888,011          
Exercise of stock options $ 13,080 108,710       121,790
Exercise of stock options (in Shares) 163,500          
Net proceeds from ATM $ 50,053 1,726,522       1,776,575
Net proceeds from ATM (in Shares) 625,677          
Stock subscription receivable         $ 9,062 9,062
Foreign currency translation     (10,395)     (10,395)
Compensation expense in connection with options granted   151,224       151,224
Net loss       (2,393,060)   (2,393,060)
Balances at May. 31, 2019 $ 774,173 $ 22,830,006 $ (36,531) $ (19,586,678)   $ 3,980,970
Balances (in Shares) at May. 31, 2019 9,677,188