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Note 9 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets, Valuation Allowance	$ 15,406,442	$ 13,881,379
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance	7,795,000	6,303,000
LiqTech China [Member]
Deferred Tax Assets, Valuation Allowance	0	479,000
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance	7,611,000	7,100,000
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	30,953,048
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 511,000	590,000
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2041
Domestic Tax Jurisdiction [Member] | Danish Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,492,000	1,077,000
Domestic Tax Jurisdiction [Member] | Chinese Ministry of Taxation [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	479,000	$ 9,000
Foreign Tax Jurisdiction [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards	$ 28,209,222

X

- Definition

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+ References

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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