Note 12 - Earnings Per Share - Amounts Used in Computing Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 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 (in shares)	41,595,856	36,835,514
Effect of dilutive securities, stock options and warrants (in shares)	0
Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share (in shares)	41,595,856	36,835,514