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Note 6 - CSS Sale (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Aug. 16, 2016
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Payment for Debt Extinguishment or Debt Prepayment Cost     $ 0 $ 1,521,000
Sypris Electronics Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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, Revenue   $ 1,769,000   11,061,000
Sypris Electronics Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Income [Member]        
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal       31,240,000
Sypris Electronics Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Loss on Extinguishment of Debt [Member]        
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 1,521,000   $ 1,521,000