v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2017
Aug. 01, 2017
Document And Entity Information    
Entity Registrant Name ACME UNITED CORP  
Entity Central Index Key 0000002098  
Document Type 10-Q  
Document Period End Date Jun. 30, 2017  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? No  
Is Entity's Reporting Status Current? Yes  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   3,371,953
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2017