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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended
	Aug. 12, 2020	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Jan. 01, 2019
General and Administrative Expense, Total		$ 6,205,040	$ 4,563,216
Nonoperating Income (Expense), Total		(2,018,398)	319,486
Restricted Cash and Cash Equivalents, Current, Total		1,515,620	2,714,173	$ 1,515,620
Cash, Uninsured Amount		0	0
Operating Lease, Right-of-Use Asset		4,947,734	5,053,614
Operating Lease, Liability, Total		5,185,460	5,141,540
Advertising Expense		96,977	117,404
Research and Development Expense, Total		1,278,331	749,249
Adjustments to Additional Paid in Capital, Warrant Issued		3,476,250
Cash and Cash Equivalents, at Carrying Value, Ending Balance			7,069,759	11,748,829
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance				$ 13,264,449
Additional Paid-in Capital [Member]
Adjustments to Additional Paid in Capital, Warrant Issued	$ 3,476,250	3,476,250
Employees [Member]
Share-based Payment Arrangement, Expense		$ 343,780	85,445
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
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					$ 2,100,000
Operating Lease, Liability, Total					$ 2,100,000
Reclassification of Earn-Out Liability to Accrued Expenses [Member]
Business Combination, Contingent Consideration, Liability, Total		$ (330,164)
Revision of Prior Period, Reclassification, Adjustment [Member]
General and Administrative Expense, Total			184,772
Nonoperating Income (Expense), Total			$ 184,772
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%