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Note 12 - Debt (Details Textual)
3 Months Ended 9 Months Ended
Apr. 01, 2019
Mar. 09, 2016
USD ($)
a
Mar. 09, 2016
MXN ($)
a
Jul. 05, 2020
USD ($)
Oct. 04, 2020
USD ($)
Sep. 29, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
Feb. 28, 2019
USD ($)
Proceeds from Notes Payable, Total         $ 3,558,000 $ 0      
Proceeds from Sale of Property, Plant, and Equipment, Total         1,969,000 $ 653,000      
Finance Lease, Liability, Total         2,412,000        
Machinery at Sypris Technologies Facility [Member]                  
Lessee, Finance Lease, Term of Contract (Year)                 5 years
Finance Lease, Liability, Total         193,000       $ 269,000
Toluca Property [Member]                  
Area of Land (Acre) | a   24 24            
Proceeds from Sale of Property, Plant, and Equipment, Total   $ 12,182,000 $ 215,000,000            
Lessee, Finance Lease, Term of Contract (Year)   10 years 10 years            
Sale Leaseback Transaction, Portion of Real Estate Property Leased Back to Seller (Acre) | a   9 9            
Finance Lease, Liability, Total         2,219,000        
Paycheck Protection Program CARES Act [Member]                  
Proceeds from Notes Payable, Total       $ 3,558,000          
Notes Payable, Total       $ 3,558,000          
Promissory Notes with Maturity on April 1, 2021 and April 1, 2023 [Member] | Gill Family Capital Management [Member]                  
Subordinated Debt, Ending Balance         $ 6,500,000        
Debt Instrument, Interest Rate, Stated Percentage               8.00%  
Debt Instrument, Allowance for Payment Deferral Period (Month)         1 year 180 days        
Debt Instrument, Maximum Allowance of Interest Due on Deferred Payments, Percent         60.00%        
Promissory Note [Member] | Gill Family Capital Management [Member]                  
Subordinated Debt, Ending Balance             $ 6,500,000    
Promissory Note [Member] | Gill Family Capital Management [Member] | Five-year Treasury Note Average During Preceding 90-day Period [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, Ending Balance         $ 2,500,000        
Promissory Note with Maturity on April 1, 2023 [Member] | Gill Family Capital Management [Member]                  
Subordinated Debt, Ending Balance         $ 2,000,000