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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	May 21, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents, Current, Total	$ 2,711,608	$ 2,711,608		$ 2,711,608			$ 2,714,173
Cash, Uninsured Amount	0	0		0			0
Advertising Expense		36,786	$ 49,757	62,023	$ 72,349
Research and Development Expense, Total		316,559	199,184	627,513	402,356
Share-based Payment Arrangement, Expense		82,335	23,167	223,557	151,611
Warrants and Rights Outstanding	2,811,900	2,811,900		2,811,900		$ 2,575,000
Fair Value Adjustment of Warrants	236,900	236,900	$ (0)	236,900	$ (0)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	13,518,661	13,518,661		13,518,661			$ 7,069,759
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 16,230,269	$ 16,230,269		$ 16,230,269
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)				5 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)				3 years
Finite-Lived Intangible Asset, Useful Life (Year)				1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)				10 years
Finite-Lived Intangible Asset, Useful Life (Year)				10 years
LiqTech USA [Member] | LiqTech International DK [Member]
Percentage of Subsidiary Owned	100.00%	100.00%		100.00%
LiqTech USA [Member] | LiqTech NA [Member]
Percentage of Subsidiary Owned	100.00%	100.00%		100.00%
LiqTech International DK [Member] | LiqTech Germany [Member]
Percentage of Subsidiary Owned	100.00%	100.00%		100.00%
LiqTech International DK [Member] | LiqTech PTE [Member]
Percentage of Subsidiary Owned	95.00%	95.00%		95.00%
LiqTech USA [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%	100.00%		100.00%

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