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Note 7 - Other Income, Net (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 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   477,000 $ (225,000)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ 322,000 495,000  
Gain on Business Interruption Insurance Recovery 2,275,000 0 $ 2,275,000
Proceeds from Insurance Settlement, Investing Activities 2,447,000    
Sypris Technologies [Member]      
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ (225,000) 477,000  
Other Current Assets [Member]      
Loss Contingency, Receivable, Ending Balance   $ 1,500,000