Consolidated Condensed Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Cash dividend per share	$ 0.25	$ 0.25	$ 0.75	$ 0.75
Class B Common Stock [Member]
Cash dividend per share	$ 0.25	$ 0.25	$ 0.75	$ 0.75
Class B common stock shares issued			21,020	20,920