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Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance	$ 12,445,765	$ 10,257,162
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance	5,226,000	3,506,000
LiqTech Germany [Member]
Deferred Tax Assets, Valuation Allowance	124,000	132,000
LiqTech Singapore [Member]
Deferred Tax Assets, Valuation Allowance	98,000	104,000
LiqTech China [Member]
Deferred Tax Assets, Valuation Allowance	488,000	193,000
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance	6,510,000	5,364,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	26,734,381
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,146,000	30,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2041
Domestic Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 6,000	9,000
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards	20,352,624
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,720,000	1,824,000
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Operating Loss Carryforwards	444,303
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	8,000	11,000
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member]
Operating Loss Carryforwards	577,266
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Operating Loss Carryforwards	1,950,649
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 295,000	$ 193,000

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+ References

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-SubTopic 10
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