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Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance	$ 13,881,379	$ 12,445,765
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance	6,303,000	5,226,000
LiqTech China [Member]
Deferred Tax Assets, Valuation Allowance	479,000	488,000
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance	7,100,000	6,510,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	29,136,593
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 590,000	1,146,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2041
Domestic Tax Authority [Member] | Danish Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,077,000
Domestic Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	9,000
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards	21,482,164
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		1,720,000
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member]
Operating Loss Carryforwards	$ 1,914,858
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 295,000

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-Topic 740
-SubTopic 10
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-Section 50
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