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Note 7 - Agreements, Commitments and Contingencies (Details Textual)
12 Months Ended
Feb. 27, 2019
USD ($)
Feb. 27, 2019
DKK (kr)
Nov. 20, 2018
USD ($)
Nov. 20, 2018
DKK (kr)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
DKK (kr)
Dec. 31, 2019
USD ($)
Defined Contribution Plan, Cost         $ 13,514   $ 10,283
Minimum [Member]              
Standard Product Warranty, Term (Year)         1 year 1 year  
Maximum [Member]              
Standard Product Warranty, Term (Year)         3 years 3 years  
Extended Product Warranty, Term (Year)         4 years 4 years  
LiqTech Ceramics [Member] | Claim with Former Supplier for Breach of Agreement [Member]              
Loss Contingency, Damages Sought, Value     $ 68,800 kr 448,500      
Litigation Settlement, Amount Awarded to Other Party         $ 96,900 kr 587,000  
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% 49.00%