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Cover - shares
 12 Months Ended
Dec. 31, 2021
May 06, 2022
Document Information Line Items    
Entity Registrant Name EURO TECH HOLDINGS COMPANY LIMITED  
Entity Central Index Key 0001026662  
Document Type 20-F/A  
Amendment Flag true  
Entity Voluntary Filers No  
Current Fiscal Year End Date --12-31  
Entity Well Known Seasoned Issuer No  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Dec. 31, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   7,732,132
Document Annual Report true  
Document Transition Report false  
Entity File Number 000-22113  
Entity Incorporation State Country Code D8  
Entity Address Address Line 2 Gee Chang Hong Centre  
Entity Address City Or Town 65 Wong Chuk Hang Road  
Entity Address Country HK  
Entity Address Postal Zip Code true  
Auditor Name Union Power HK CPA Limited  
Auditor Location Hong Kong  
Auditor Firm Id 3004  
Security 12b Title Ordinary Shares, no par value  
Trading Symbol CLWT  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes  
Document Shell Company Report false  
Document Registration Statement false  
Entity Other Identification Type David YL Leung  
Document Accounting Standard U.S. GAAP  
Amendment Description Euro Tech Holdings Company Limited (the “Company”) is filing this Amendment No. 1 on Form 20-F (this “Amendment”) to the Annual Report on Form 20-F for the fiscal year ended December 31, 2021 (the “Original Filing”), which was originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on May 16, 2022, to add certain disclosure in “Item 3. Key Information”, to revise and restate in its entirety the Consolidated Financial Statements, and to make conforming changes in the other parts of the Original Filings to (i) provide additional disclosure regarding the legal and operational risks associated with being based in or having the majority of the Company’s operations in China, (ii) revise and clarify certain disclosure with respect to the cash and asset flows through its organization, and (iii) state that the Company has been included on the conclusive list of issuers identified under the HFCAA and add disclosure about the ramifications of such identification, and (iv) certain changes related to the financial statements, which we have summarized below.    a)to update the Consolidated Statement of Operations and Comprehensive Income / (Loss) for the years ended December 31, 2021, 2020 and 2019 to reclassify (loss) / gain on disposal of property, plant and equipment in operating income / (loss).    b)to correct the number of ordinary shares outstanding and earnings per share computations for effect of the stock splits effected in the form of bonus shares:  ●update the Consolidated Balance Sheets to restate the ordinary shares issued as of December 31, 2021 and 2020;  ●update the Consolidated Statement of Operations and Comprehensive Income / (Loss) for the years ended December 31, 2021, 2020 and 2019 to restate the Net income / (loss) per ordinary share attributable to Euro Tech Holdings Company Limited’s shareholders; and weighted average number of ordinary shares outstanding;  ●update the Consolidated Statements of Shareholders’ Equity to restate the number of ordinary share at December31, 2018, 2019, 2020 and 2021;  ●update Note 2 Summary of significant accounting policies (s) Ordinary share, Note 11 Ordinary share, Note 16 Net income per ordinary share, and Note 24 Subsequent event.  c)to add “Note 2 Summary of significant accounting policies (ai) Effect of the Restatement on the Consolidated Financial Statements for the year ended December 31, 2021” to reflect the changes described above.    d)to include the revised Report of Independent Registered Public Accounting Firm of Union Power HK CPA Limited on the restated Consolidated Financial Statements. This Amendment does not reflect subsequent events occurring after the filing date of the Original Filing or modify or update the financial statements, consents or any other items disclosures made in the Original Filing  in any way other than as required to reflect the amendments discussed above. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings with the SEC subsequent to the filing of the Original Filing. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment also contains certifications under the Sarbanes-Oxley Act of 2002.  
Entity Address Address Line 1 Unit D, 18/F.  
Business Contact [Member]    
Document Information Line Items    
Phone Fax Number Description 852-28734887  
Entity Address Address Line 2 Gee Chang Hong Centre  
Entity Address City Or Town 65 Wong Chuk Hang Road  
Entity Address Country HK  
Entity Address Address Line 1 Unit D, 18/F.  
Contact Personnel Name David YL Leung