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Note 8 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance, Total | $ 5,285,222 | $ 5,422,433
LiqTech International Inc and LiqTech NA [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 3,845,000 | 3,428,000
LiqTech International AS and LiqTech Systems AS [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 1,209,000 | 1,846,000
LiqTech Germany [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 129,000 | 132,000
LiqTech Singapore [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 102,000 | 105,000
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 19,258,541 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 416,000 | 460,000
Danish Ministry of Taxation [Member] | Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 8,228,823 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (637,000) | 42,000
Federal Ministry of Finance, Germany [Member] | Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 464,022 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (3,000) | (7,000)
Inland Revenue, Singapore (IRAS) [Member] | Foreign Tax Authority [Member] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 602,887 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (2,000) | $ (5,000)

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