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Note 10 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total | $ 10,257,162 | $ 7,331,357
LiqTech International AS and LiqTech Systems AS [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 3,506,000 | 1,682,000
LiqTech Germany [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 132,000 | 143,000
LiqTech Singapore [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 104,000 | 113,000
LiqTech China [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 193,000 | 0
LiqTech International Inc and LiqTech NA [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 5,364,000 | 5,394,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | 23,172,440 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 30,000 | 1,549,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2041 |
Domestic Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 9,000 |
Foreign Tax Authority [Member] | Danish Ministry of Taxation [Member] |  |
Operating Loss Carryforwards, Total | 16,039,713 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 1,824,000 | 473,000
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member] |  |
Operating Loss Carryforwards, Total | 472,134 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 11,000 | 14,000
Foreign Tax Authority [Member] | Inland Revenue, Singapore (IRAS) [Member] |  |
Operating Loss Carryforwards, Total | 613,426 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 11,000
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member] |  |
Operating Loss Carryforwards, Total | 118,602 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 193,000 |
Foreign Tax Authority [Member] | Chinese Ministry of Taxation [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2026 |

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