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Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total	$ 10,257,162	$ 7,331,357
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance, Total	3,506,000	1,682,000
LiqTech Germany [Member]
Deferred Tax Assets, Valuation Allowance, Total	132,000	143,000
LiqTech Singapore [Member]
Deferred Tax Assets, Valuation Allowance, Total	104,000	113,000
LiqTech China [Member]
Deferred Tax Assets, Valuation Allowance, Total	193,000	0
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance, Total	5,364,000	5,394,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	23,172,440
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 30,000	1,549,000
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	$ 9,000
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member]
Operating Loss Carryforwards, Total	16,039,713
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,824,000	473,000
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Operating Loss Carryforwards, Total	472,134
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	11,000	14,000
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member]
Operating Loss Carryforwards, Total	613,426
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 11,000
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member]
Operating Loss Carryforwards, Total	118,602
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 193,000
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Year	2026

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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