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Note 5 - Exit and Disposal Activities (Details Textual) - Transition of Production from the Broadway Plant [Member] - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2017
Dec. 31, 2016
Oct. 01, 2017
Dec. 31, 2016
Restructuring and Related Cost, Incurred Cost $ 357,000   $ 2,235,000 $ 645,000
Restructuring and Related Cost, Incurred Cost, Per Share $ 0.02   $ 0.11 $ 0.03
Restructuring and Related Cost, Expected Cost Remaining $ 2,526,000   $ 2,526,000  
Impairment of Long-Lived Assets to be Disposed of   $ 188,000    
Sypris Electronics [Member]        
Restructuring and Related Cost, Expected Cost Remaining 2,526,000   2,526,000  
Employee Severance [Member]        
Restructuring and Related Cost, Incurred Cost     1,017,000 $ 427,000
Restructuring and Related Cost, Expected Cost Remaining $ 0   $ 0