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Note 8 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total	$ 7,331,357	$ 5,285,222
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance, Total	5,394,000	3,845,000
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance, Total	1,682,000	1,209,000
LiqTech Germany [Member]
Deferred Tax Assets, Valuation Allowance, Total	143,000	129,000
LiqTech Singapore [Member]
Deferred Tax Assets, Valuation Allowance, Total	113,000	102,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	21,618,896
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,549,000	416,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2038
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards, Total	$ 8,996,626
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	473,000	(637,000)
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Operating Loss Carryforwards, Total	511,385
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	14,000	(3,000)
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member]
Operating Loss Carryforwards, Total	664,423
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 11,000	$ (2,000)

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