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Note 6 - 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, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
DKK (kr)
Defined Contribution Plan, Cost         $ 2,621 $ 2,693  
Line of Credit Facility, Maximum Borrowing Capacity         14,240   kr 94,620
Guarantor Obligations, Current Carrying Value         $ 15,743   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