Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
3 Months Ended
Mar. 31, 2020
May 04, 2020
Document and Entity Information [Abstract]    
Entity Registrant Name Synalloy Corporation  
Entity Central Index Key 0000095953  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   9,058,040
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Entity Current Reporting Status Yes  
Emerging Growth Company false  
Entity Shell Company false  
Smaller Reporting Company true