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Note 5 - Agreements and Commitments (Details Textual)					3 Months Ended
	Feb. 27, 2019 USD ($)	Feb. 27, 2019 DKK (kr)	Nov. 20, 2018 USD ($)	Nov. 20, 2018 DKK (kr)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018
Defined Contribution Plan, Cost					$ 3,949	$ 2,621
Warranty Accrual, Percent					3.00%		7.00%
Purchase Obligation, Total					$ 3,800,000
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
LiqTech International AS [Member] | Claim with Former Supplier for Breach of Agreement [Member]
Loss Contingency, Damages Sought, Value			$ 68,800	kr 448,500
LiqTech International AS [Member] | Claim with Former Supplier for Services Rendered [Member]
Loss Contingency, Damages Sought, Value	$ 83,400	kr 543,905

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.

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+ References

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- Definition

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- Definition

Amount of cost for defined contribution plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
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- Definition

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

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-Publisher FASB
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-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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