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Note 6 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three Months
Ended March 31,
 
   
2020
   
2019
 
Net Income attributable to LiqTech International Inc.
  $
303,499
    $
34,244
 
Weighted average number of common shares used in basic earnings per share
   
20,554,524
     
18,267,068
 
Effect of dilutive securities, stock options, RSU’s, and warrants
   
156,511
     
878,807
 
Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share
   
20,711,035
     
19,145,875