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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 29, 2018
Dec. 30, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common shares, par value (in dollars per share) $ 0.25 $ 0.25
Common shares, authorized shares 3,000,000 3,000,000
Common shares, issued shares 2,574,264 2,574,264
Treasury, shares 876,409 892,097