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CONSOLIDATED STATEMENTS OF SHAREHOLDERS` EQUITY - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Subscriptions Receivable [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balances at May. 31, 2016 $ 653,573 $ 19,399,720 $ (13,586) $ (14,819,229) $ 5,220,478
Balances (in Shares) at May. 31, 2016 8,169,673          
Exercise of stock options $ 27,320 130,408       $ 157,728
Exercise of stock options (in Shares) 341,500         341,500
Foreign currency translation       (2,248)   $ (2,248)
Compensation expense in connection with options granted   21,727       21,727
Net loss         (908,561) (908,561)
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         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 $ (9,062) $ (26,136) $ (17,193,618) $ 4,325,774
Balances (in Shares) at May. 31, 2018 8,888,011