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Note 7 - Geographic Segmented Information (Tables)
9 Months Ended
Feb. 28, 2019
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
    Canada     United States     Total  
                   
February 28, 2019                        
Capitalized acquisition costs   $
—  
    $
5,436,745
    $
5,436,745
 
Property and equipment   $
8,680
    $
39,107
    $
47,787
 
                         
May 31, 2018                        
Capitalized acquisition costs   $
—  
    $
5,238,789
    $
5,238,789
 
Property and equipment   $
11,200
    $
45,290
    $
56,490
 
Net Income (Loss) by Geographic Areas [Table Text Block]
For the period ended February 28,   2019     2018  
             
Net loss for the period - Canada   $
(2,594,785
)   $
(1,938,545
)
Net loss for the period - United States    
(5,401,137
)    
(5,175,098
)
                 
Net loss for the period   $
(7,995,922
)   $
(7,113,643
)