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Note 7 - Other Expense (Income), Net (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 29, 2019
Sep. 30, 2018
Gain (Loss) Related to Litigation Settlement, Total       $ 1,500,000  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property     $ 467,000   $ (241,000)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (248,000) $ (161,000)   (743,000) (483,000)
Proceeds from Insurance Settlement, Investing Activities         2,447,000
Gain on Business Interruption Insurance Recovery     $ 0   2,275,000
Sypris Technologies [Member]          
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property       467,000 $ (241,000)
Other Current Assets [Member]          
Loss Contingency, Receivable, Ending Balance $ 1,500,000     $ 1,500,000