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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 12, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Restricted Cash and Cash Equivalents, Current, Total		$ 1,500,000		$ 1,500,000		$ 1,515,620
Cash, Uninsured Amount		0		0		$ 0
Advertising Expense		42,843	$ 36,786	125,235	$ 62,023
Research and Development Expense, Total		434,629	316,559	872,236	627,513
Share-based Payment Arrangement, Expense		$ 125,076	$ 82,335	$ 227,464	$ 223,557
Additional Paid-in Capital [Member]
Adjustments to Additional Paid in Capital, Warrant Issued	$ 3,476,250
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%		100.00%
LiqTech USA [Member] \| LiqTech NA [Member]
Percentage of Subsidiary Owned		100.00%		100.00%
LiqTech International DK [Member] \| LiqTech Germany [Member]
Percentage of Subsidiary Owned		100.00%		100.00%
LiqTech International DK [Member] \| LiqTech PTE [Member]
Percentage of Subsidiary Owned		95.00%		95.00%
LiqTech USA [Member]
Noncontrolling Interest, Ownership Percentage by Parent		100.00%		100.00%