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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents, Current, Total	$ 117,904	$ 0		$ 0
Cash, Uninsured Amount	0			0
Operating Lease, Right-of-Use Asset	1,930,932
Operating Lease, Liability, Total	$ 1,963,856
Value Added Tax Of Invoice, Percentage	25.00%
Advertising Expense	$ 22,592	528
Research and Development Expense, Total	203,172	169,396
Share-based Payment Arrangement, Expense	15,944	$ 78,273
Cash and Cash Equivalents, at Carrying Value, Ending Balance	2,483,141			$ 3,776,111
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 2,601,045
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%
LiqTech USA [Member] \| LiqTech NA [Member]
Percentage of Subsidiary Owned	100.00%
LiqTech International DK [Member] \| LiqTech Germany [Member]
Percentage of Subsidiary Owned	100.00%
LiqTech International DK [Member] \| LiqTech PTE [Member]
Percentage of Subsidiary Owned	95.00%