Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalents, Current, Total	$ 2,125,695	$ 1,515,620
Cash, Uninsured Amount	11,346,826	0
Advertising Expense	308,880	128,826
Research and Development Expense, Total	1,862,653	1,278,331
Cash and Cash Equivalents, at Carrying Value, Ending Balance	15,363,685	11,748,829
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	17,489,380
Employees [Member]
Share-based Payment Arrangement, Expense	$ 481,105	$ 343,780
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
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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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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