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Note 5 - Agreements and Commitments (Details Textual)					6 Months Ended
	Feb. 27, 2019 USD ($)	Feb. 27, 2019 DKK (kr)	Nov. 20, 2018 USD ($)	Nov. 20, 2018 DKK (kr)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 DKK (kr)	Jun. 30, 2018 DKK (kr)
Defined Contribution Plan, Cost					$ 5,677	$ 5,706
Line of Credit Facility, Maximum Borrowing Capacity					$ 14,427		kr 94,620
Guarantor Obligations, Current Carrying Value						$ 14,801		kr 94,620
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

Amount of cost for defined contribution plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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