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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Restricted Cash and Cash Equivalents, Current, Total | $ 2,714,173 | $ 0 |
Cash, Uninsured Amount | 0 | 0 |
Operating Lease, Right-of-Use Asset | 5,053,614 |  |
Operating Lease, Liability, Total | 5,141,540 |  |
Advertising Expense | 117,404 | 38,951 |
Research and Development Expense, Total | 749,249 | 661,014 |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 7,069,759 | 3,776,111 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance | 9,783,932 |  |
Employees [Member] |  |  |
Share-based Payment Arrangement, Expense | $ 85,445 | $ 56,434 |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 2,100,000
Operating Lease, Liability, Total |  |  | $ 2,100,000
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 International DK [Member] | LiqTech Germany [Member] |  |  |
Percentage of Subsidiary Owned | 100.00% |  |
LiqTech International DK [Member] | LiqTech PTE [Member] |  |  |
Percentage of Subsidiary Owned | 95.00% |  |
LiqTech USA [Member] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |

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