Annual report pursuant to Section 13 and 15(d)

Dispositions and Closures (Details)

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Dispositions and Closures (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 01, 2014
Sep. 30, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 27, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss before income taxes     $ 0 $ (99,334) $ (1,251,058)  
Bristol Fab [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pension withdrawal liability           $ 1,904,628
Bristol Fab and Ram-fab [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net sales       0 0  
Loss before income taxes       (150,334) (1,902,058)  
Benefit from income taxes       (51,000) (651,000)  
Net loss from discontinued operations       (99,334) (1,251,058)  
Pending Litigation [Member] | Synalloy Fabrication, LLC Customer Breach of Contract Case [Member]            
Liabilities            
Litigation damages sought   $ 3,300,000        
Pending Litigation [Member] | Synalloy Fabrication, LLC Customer Breach of Contract Case [Member] | Bristol Fab [Member]            
Liabilities            
Litigation damages sought       99,334 $ 1,251,058  
Loss Contingency Accrual       $ 0    
Withdrawal from Multiemployer Defined Benefit Plan [Member] | Bristol Fab [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Debt Instrument, Term 26 months          
Stated interest rate (percent)       4.51%