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Note 4 - Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Net revenue $ 21,101 $ 21,371 $ 64,014 $ 60,805
Sypris Technologies [Member]        
Net revenue 14,852 13,547 44,686 40,366
Sypris Technologies [Member] | Transferred at Point in Time [Member]        
Net revenue 14,852   44,686  
Sypris Electronics [Member]        
Net revenue 6,249 $ 7,824 19,328 $ 20,439
Sypris Electronics [Member] | Transferred at Point in Time [Member]        
Net revenue 1,510   3,664  
Sypris Electronics [Member] | Transferred over Time [Member]        
Net revenue $ 4,739   $ 15,664