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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%

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