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Note 14 - Debt (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2019
Mar. 09, 2016
USD ($)
a
Mar. 09, 2016
MXN ($)
a
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Aug. 31, 2016
USD ($)
Long-term Debt, Weighted Average Interest Rate, at Point in Time         8.00% 8.00% 8.00%  
Long-term Debt, Weighted Average Interest Rate, over Time           8.00% 10.40%  
Interest Costs Capitalized           $ 0 $ 0  
Interest Paid, Net           526,000 3,579,000  
Subsequent Event [Member]                
Capital Lease Obligations       $ 1,277,000        
Subsequent Event [Member] | Capital Lease Obligations [Member]                
Debt Instrument, Term       3 years        
Toluca [Member]                
Sale Leaseback Transaction, Amount Due under Financing Arrangement         $ 2,949,000 2,949,000    
Toluca [Member] | Sypris Technologies Mexico, S. de R.L. de C.V. [Member]                
Area of Land | a   24 24          
Sale Leaseback Transaction, Net Proceeds, Investing Activities   $ 12,182,000 $ 215,000,000          
Sale Leaseback Transaction, Term of Lease   10 years 10 years          
Sale Leaseback Transaction, Portion of Real Estate Property Leased Back to Seller | a   9 9          
Promissory Note [Member] | Gill Family Capital Management [Member]                
Subordinated Debt         $ 6,500,000 $ 6,500,000 $ 6,500,000 $ 6,500,000
Debt Instrument, Interest Rate, Stated Percentage         8.00% 8.00%    
Promissory Note [Member] | Gill Family Capital Management [Member] | Five-year Treasury Note Average During Preceding 90-day Period [Member] | Scenario, Forecast [Member]                
Debt Instrument, Basis Spread on Variable Rate 5.00%              
Promissory Note with Maturity on April 1, 2021 [Member] | Gill Family Capital Management [Member]                
Subordinated Debt         $ 2,500,000 $ 2,500,000    
Promissory Note with Maturity on April 1, 2023 [Member] | Gill Family Capital Management [Member]                
Subordinated Debt         $ 2,000,000 $ 2,000,000    
Promissory Notes with Maturity on April 1, 2021 and April 1, 2023 [Member] | Gill Family Capital Management [Member]                
Debt Instrument, Interest Rate, Stated Percentage         8.00% 8.00%    
Debt Instrument, Allowance for Payment Deferral Period         18 years      
Debt Instrument, Maximum Allowance of Interest Due on Deferred Payments, Percent         60.00%      
Promissory Notes with Maturity on April 1, 2021 and April 1, 2023 [Member] | Gill Family Capital Management [Member] | Five-year Treasury Note Average During Preceding 90-day Period [Member]                
Debt Instrument, Basis Spread on Variable Rate         500.00%