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Note 1 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	May 26, 2023 $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Apr. 08, 2021 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Restricted Cash and Cash Equivalents, Current		$ 941,361	$ 1,440,394
Cash, Uninsured Amount		0	12,999,271
Tangible Asset Impairment Charges		0	0
Advertising Expense		70,580	144,043
Research and Development Expense, Total		1,418,842	1,835,890
Employees [Member]
Share-Based Payment Arrangement, Expense		$ 627,904	$ 934,423
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
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	8
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 USA [Member]
Noncontrolling Interest, Ownership Percentage by Parent		100.00%

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