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Note 7 - Agreements and Commitments (Details Textual)
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
DKK (kr)
Feb. 27, 2019
USD ($)
Feb. 27, 2019
DKK (kr)
Mar. 31, 2022
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     $ 59,700 kr 400,000    
Arbitration Regarding Commercial Dispute Related to Delivery of Water Treatment System [Member]            
Loss Contingency, Damages Sought, Value $ 249,510 kr 1,671,768        
LiqTech International AS [Member] | Claim with Former Supplier for Services Rendered [Member]            
Loss Contingency, Damages Sought, Value     $ 81,177 kr 543,905    
Joint Venture Agreement [Member]            
Equity Method Investment, Ownership Percentage           49.00%