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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | May 21, 2020 | Dec. 31, 2019
Restricted Cash and Cash Equivalents, Current, Total | $ 2,711,608 | $ 2,711,608 |  | $ 2,711,608 |  |  | $ 2,714,173
Cash, Uninsured Amount | 0 | 0 |  | 0 |  |  | 0
Advertising Expense |  | 36,786 | $ 49,757 | 62,023 | $ 72,349 |  |
Research and Development Expense, Total |  | 316,559 | 199,184 | 627,513 | 402,356 |  |
Share-based Payment Arrangement, Expense |  | 82,335 | 23,167 | 223,557 | 151,611 |  |
Warrants and Rights Outstanding | 2,811,900 | 2,811,900 |  | 2,811,900 |  | $ 2,575,000 |
Fair Value Adjustment of Warrants | 236,900 | 236,900 | $ (0) | 236,900 | $ (0) |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 13,518,661 | 13,518,661 |  | 13,518,661 |  |  | $ 7,069,759
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance | $ 16,230,269 | $ 16,230,269 |  | $ 16,230,269 |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 5 years |  |  |
Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 3 years |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 10 years |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 10 years |  |  |
LiqTech USA [Member] | LiqTech International DK [Member] |  |  |  |  |  |  |
Percentage of Subsidiary Owned | 100.00% | 100.00% |  | 100.00% |  |  |
LiqTech USA [Member] | LiqTech NA [Member] |  |  |  |  |  |  |
Percentage of Subsidiary Owned | 100.00% | 100.00% |  | 100.00% |  |  |
LiqTech International DK [Member] | LiqTech Germany [Member] |  |  |  |  |  |  |
Percentage of Subsidiary Owned | 100.00% | 100.00% |  | 100.00% |  |  |
LiqTech International DK [Member] | LiqTech PTE [Member] |  |  |  |  |  |  |
Percentage of Subsidiary Owned | 95.00% | 95.00% |  | 95.00% |  |  |
LiqTech USA [Member] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% | 100.00% |  | 100.00% |  |  |

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