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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents, Current, Total	$ 783,499	$ 0	$ 783,499	$ 0		$ 0
Cash, Uninsured Amount	0		0			0
Operating Lease, Right-of-Use Asset	1,925,645		1,925,645
Operating Lease, Liability, Total	1,955,901		$ 1,955,901
Value Added Tax Of Invoice, Percentage			25.00%
Advertising Expense			$ 72,349	3,326
Research and Development Expense, Total	199,184	$ 176,281	402,356	345,677
Share-based Payment Arrangement, Expenses Including Shares Issued as a Bonus			151,611	$ 87,434
Cash and Cash Equivalents, at Carrying Value, Ending Balance	12,572,856		12,572,856			$ 3,776,111
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 13,356,355		$ 13,356,355
Minimum [Member]
Property, Plant and Equipment, Useful Life			3 years
Finite-Lived Intangible Asset, Useful Life			2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life			10 years
Finite-Lived Intangible Asset, Useful Life			10 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					$ 2,100,000
Operating Lease, Liability, Total					$ 2,100,000
LiqTech USA [Member] | LiqTech International DK [Member]
Percentage of Subsidiary Owned	100.00%		100.00%
LiqTech USA [Member] | LiqTech NA [Member]
Percentage of Subsidiary Owned	100.00%		100.00%
LiqTech International DK [Member] | LiqTech Germany [Member]
Percentage of Subsidiary Owned	100.00%		100.00%
LiqTech International DK [Member] | LiqTech PTE [Member]
Percentage of Subsidiary Owned	95.00%		95.00%
LiqTech USA [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%		100.00%

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