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Note 9 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Deferred Tax Assets, Valuation Allowance | $ 15,406,442 | $ 13,881,379
LiqTech International AS and LiqTech Systems AS [Member] |  |
Deferred Tax Assets, Valuation Allowance | 7,795,000 | 6,303,000
LiqTech China [Member] |  |
Deferred Tax Assets, Valuation Allowance | 0 | 479,000
LiqTech International Inc and LiqTech NA [Member] |  |
Deferred Tax Assets, Valuation Allowance | 7,611,000 | 7,100,000
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | 30,953,048 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 511,000 | 590,000
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2041 |
Domestic Tax Jurisdiction [Member] | Danish Ministry of Taxation [Member] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,492,000 | 1,077,000
Domestic Tax Jurisdiction [Member] | Chinese Ministry of Taxation [Member] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 479,000 | $ 9,000
Foreign Tax Jurisdiction [Member] | Danish Ministry of Taxation [Member] |  |
Operating Loss Carryforwards | $ 28,209,222 |

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