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Note 6 - Other Income, Net (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 2,668,000 $ 33,626,000
Foreign Currency Transaction Gain (Loss), before Tax (773,000) 951,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Income [Member] | Sypris Electronics [Member]    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 1,913,000 31,240,000
Toluca [Member] | Other Income [Member]    
Sale Leaseback Transaction, Current Period Gain Recognized   $ 2,370,000