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Note 4 - CSS Sale (Details Textual) - USD ($)
12 Months Ended
Aug. 16, 2016
Dec. 31, 2017
Dec. 31, 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     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