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Note 6 - Earnings Per Share - Amounts Used in Computing Earnings Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Income (Loss) attributable to LiqTech International Inc. $ (2,563,811) $ 303,499 $ 146,786 $ 34,244 $ (2,260,312) $ 181,030
Weighted average number of common shares used in basic earnings per share (in shares) 20,963,186   19,211,771   20,758,855 18,742,029
Effect of dilutive securities, stock options, RSUs, and warrants (in shares)         0 16,079
Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share (in shares) 20,963,186   19,228,160   20,758,855 18,758,108