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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 29, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity, Registrant Name LiqTech International, Inc.    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2023    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2023    
Document, Transition Report false    
Entity, File Number 001-36210    
Entity, Incorporation, State or Country Code NV    
Entity, Tax Identification Number 20-1431677    
Entity, Address, Address Line One Industriparken 22C    
Entity, Address, Postal Zip Code DK 2750    
Entity, Address, City or Town Ballerup    
Entity, Address, Country DK    
City Area Code 453    
Local Phone Number 1315941    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol LIQT    
Security Exchange Name NASDAQ    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Non-accelerated Filer    
Entity, Small Business true    
Entity, Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document, Financial Statement Error Correction Flag false    
Entity, Shell Company false    
Entity, Public Float     $ 16,158,560
Entity, Common Stock Shares, Outstanding   5,807,340  
Amendment Description This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment No. 1”) of LiqTech International, Inc. (“LiqTech” or the “Company”) amends the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, which was filed with the Securities and Exchange Commission (“SEC”) on March 21, 2024 (the “Original Filing”). The Company is filing this Amendment No. 1 solely to file Part III (Items 10 through 14). This additional disclosure does not revise or alter the Company’s financial statements and any forward-looking statements contained in the Original Filing. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), this Amendment No. 1 contains new certifications by our principal executive officer and principal financial officer, which are being filed or furnished as exhibits to this Amendment No. 1.    
Auditor Name Sadler, Gibb & Associates, LLC    
Auditor Location Draper, UT    
Auditor Firm ID 3627    
Amendment Flag true    
Entity, Central Index Key 0001307579