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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 10, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Fiscal Period Focus FY    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Transition Report false    
Entity File Number 001-12505    
Entity Registrant Name CORE MOLDING TECHNOLOGIES, INC    
Entity Incorporation State Country Code DE    
Entity Tax Identification Number 31-1481870    
Entity Address, Address Line 800 Manor Park Drive    
Entity Address, City Or Town Columbus    
Entity Address, State Or Province OH    
Entity Address, Postal Zip Code 43228-0183    
City Area Code 614    
Local Phone Number 870-5000    
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    
Entity Shell Company false    
Entity Central Index Key 0001026655    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 22,061,000
Documents Incorporated By Reference [Text Block]
DOCUMENTS INCORPORATED BY REFERENCE
 
 
Portions of the
 
registrant's 2021
 
definitive Proxy Statement
 
to be filed
 
with the Securities
 
and Exchange Commission
 
no later
than 120 days after the end of the registrant's fiscal year are incorporated
 
herein by reference in Part III of this Form 10-K.
    
ICFR Auditor Attestation Flag false    
Common Class [Member]      
Entity Information [Line Items]      
Security 12b Title Common Stock, par value $0.01    
Security Exchange Name NYSEAMER    
Trading Symbol CMT    
Entity Common Stock, Shares Outstanding   8,476,047  
Preferred Class [Member]      
Entity Information [Line Items]      
Security 12b Title Preferred Stock purchase rights, par value $0.01    
Security Exchange Name NYSEAMER    
No Trading Symbol true    
Restricted Stock [Member] | Common Class [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   507,835