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Note 8 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total | $ 7,331,357 | $ 5,285,222
LiqTech International Inc and LiqTech NA [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 5,394,000 | 3,845,000
LiqTech International AS and LiqTech Systems AS [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 1,682,000 | 1,209,000
LiqTech Germany [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 143,000 | 129,000
LiqTech Singapore [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 113,000 | 102,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | 21,618,896 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,549,000 | 416,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2038 |
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member] |  |
Operating Loss Carryforwards, Total | $ 8,996,626 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 473,000 | (637,000)
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member] |  |
Operating Loss Carryforwards, Total | 511,385 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 14,000 | (3,000)
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member] |  |
Operating Loss Carryforwards, Total | 664,423 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 11,000 | $ (2,000)

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