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Note 5 - CSS Sale (Details Textual) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - USD ($)
 3 Months Ended 9 Months Ended
Aug. 16, 2016
Oct. 02, 2016
Oct. 04, 2015
Oct. 02, 2016
Oct. 04, 2015
Sypris Electronics Assets [Member] | Other Income [Member]          
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 31,240,000   $ 31,240,000  
Sypris Electronics Assets [Member]          
Disposal Group, Including Discontinued Operation, Consideration $ 42,000,000        
Escrow Deposit $ 1,500,000        
Escrow Deposit, Holding Period 1 year        
Disposal Group, Including Discontinued Operation, Assets $ 8,086,000        
Disposal Group, Including Discontinued Operation, Inventory 6,562,000        
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 1,050,000        
Disposal Group, Including Discontinued Operation, Other Assets, Current 624,000        
Disposal Group, Including Discontinued Operation, Accrued Liabilities 150,000        
Disposal Group, Incurred Transaction Related Expenses $ 2,674,000        
Sypris Electronics Product Line [Member]          
Disposal Group, Including Discontinued Operation, Revenue   $ 1,769,000 $ 6,822,000 $ 11,061,000 $ 10,786,000