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Note 9 - Capital Risk Management (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of capital risk management [text block]
      December 31, 
2018		       December 31,
2017		  
Equity   $
213,881
     $
220,239
  
Cash and cash equivalents    
(130,180
 )    
(160,395
 )
    $
83,701
     $
59,844