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Note 10 - Financial Risk Management (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of credit risk exposure [text block]
      December 31,
2018		       December 31,
2017		  
Cash and cash equivalents   $
130,180
     $
160,395
  
Accounts receivable (
Note 4
)
    
372
      
160
  
    $
130,552
     $
160,555
  
Disclosure of market risk [text block]
December 31, 2018 (
in US$ equivalent
)
      Mexican peso        Canadian dollar  
                 
Cash   $
31
     $
259
  
Accounts receivable    
133
      
23
  
Prepaid    
8
      
–
  
Investments    
–
      
1,781
  
Accounts payable    
(119
 )    
(424
 )
Net assets exposure   $
53
     $
1,639