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Note 4 - CSS Sale (Details Textual) - Sypris Electronics Assets [Member] - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - USD ($)
 12 Months Ended
Aug. 16, 2016
Dec. 31, 2016
Dec. 31, 2015
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 $ 8,137,000    
Disposal Group, Including Discontinued Operation, Inventory 6,613,000    
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    
Disposal Group, Including Discontinued Operation, Revenue   $ 11,061,000 $ 16,715,000
Other Income [Member]      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 31,189,000