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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% |  |  |

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