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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Cover [Abstract]      
Entity Registrant Name ACME UNITED CORP    
Entity Central Index Key 0000002098    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   3,754,498  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Entity Public Float     $ 115,019,745
Trading Symbol ACU    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Small Business true    
Entity Shell Company false    
Entity File Number 01-07698    
Entity Tax Identification Number 06-0236700    
Entity Address, Address Line One 1 Waterview Drive    
Entity Address, City or Town Shelton    
Entity Address, State or Province CT    
Entity Address, Postal Zip Code 06484    
City Area Code 203    
Local Phone Number 254-6060    
Entity Interactive Data Current Yes    
Title of 12(b) Security $2.50 par value Common Stock    
Security Exchange Name NYSEAMER    
Entity Incorporation, State or Country Code CT    
Document Annual Report true    
Document Transition Report false    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
ICFR Auditor Attestation Flag true    
Auditor Name Marcum LLP    
Auditor Location Boston, Massachusetts    
Auditor Firm Id 688    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

(1) Certain portions of the Company’s Proxy Statement for the Annual Meeting scheduled for April 21, 2025 are incorporated into the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, in Part III.

    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated balance sheets of Acme United Corporation and Subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive income, changes in stockholders’ equity and cash flows for each of the two years in the period ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, based on our audits, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) ("PCAOB"), the Company's internal control over financial reporting as of December 31, 2024, based on the criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in 2013 and our report dated March 6, 2025, expressed an adverse opinion on the effectiveness of the Company’s internal control over financial reporting because of the existence of a material weakness.