XML 12 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document and Entity Information Document - shares
 6 Months Ended
Jun. 30, 2020
Aug. 07, 2020
Entity Information [Line Items]    
Entity Interactive Data Current Yes  
Entity Registrant Name CORE MOLDING TECHNOLOGIES INC.  
Entity Central Index Key 0001026655  
Document Type 10-Q  
Document Period End Date Jun. 30, 2020  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   8,501,229