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Note 9 - Agreements and Commitments (Details Textual)			12 Months Ended
	Feb. 27, 2019 USD ($)	Feb. 27, 2019 DKK (kr)	Dec. 31, 2021	Jun. 30, 2021
Minimum [Member]
Standard Product Warranty, Term (Year)			1 year
Maximum [Member]
Standard Product Warranty, Term (Year)			3 years
Extended Product Warranty, Term (Year)			4 years
Claim with Former Supplier for Services Rendered [Member]
Litigation Settlement, Amount Awarded to Other Party	$ 63,575	kr 400,000
LiqTech International AS [Member] | Claim with Former Supplier for Services Rendered [Member]
Loss Contingency, Damages Sought, Value	$ 89,800	kr 543,905
Joint Venture Agreement [Member]
Equity Method Investment, Ownership Percentage				49.00%

X

- Definition

The period for the extended product warranty, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	liqt_
Data Type:	xbrli:durationItemType
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Period Type:	duration

X

- Definition

The period of the standard product warranty, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	liqt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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X

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X

- Details

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X

- Details

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