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Note 6 - Agreements and Commitments (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 27, 2019
USD ($)
Feb. 27, 2019
DKK (kr)
Nov. 20, 2018
USD ($)
Nov. 20, 2018
DKK (kr)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
DKK (kr)
Defined Contribution Plan, Cost         $ 0 $ 3,949 $ 718 $ 6,984    
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 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%