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v3.24.1

Note 1 - Summary of Significant Accounting Policies (Details Textual) |  | 12 Months Ended |
--- | --- | --- | ---
May 26, 2023 $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Apr. 08, 2021 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001
Restricted Cash and Cash Equivalents, Current |  | $ 941,361 | $ 1,440,394 |
Cash, Uninsured Amount |  | 0 | 12,999,271 |
Tangible Asset Impairment Charges |  | 0 | 0 |
Advertising Expense |  | 70,580 | 144,043 |
Research and Development Expense, Total |  | 1,418,842 | 1,835,890 |
Employees [Member] |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 627,904 | $ 934,423 |
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 |  |
Reverse Stock Split [Member] |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 8 |  |  |
LiqTech USA [Member] | LiqTech International DK [Member] |  |  |  |
Percentage of Subsidiary Owned |  | 100.00% |  |
LiqTech USA [Member] | LiqTech NA [Member] |  |  |  |
Percentage of Subsidiary Owned |  | 100.00% |  |
LiqTech USA [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 100.00% |  |

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