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Note 12 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Year Ended December 31
  
   
2017
    
2016
  
Net Loss attributable to LiqTech International Inc.
   $
(4,460,353
)
   $
(16,418,634
)
Weighted average number of common shares used in basic earnings per share
    
41,595,856
      
36,835,514
  
Effect of dilutive securities, stock options and warrants
    
-
      
-
  
Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share
    
41,595,856
      
36,835,514