Consolidated Condensed Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
Mar. 31, 2019	Apr. 01, 2018
Cash dividend per share	$ 0.25	$ 0.25
Class B Common Stock [Member]
Cash dividend per share	$ 0.25	$ 0.25
Class B common stock shares issued	19,224	20,296

Number of new stock issued during the period.

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Period Type:	duration