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Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of shares of common stock issued under stock option plan	48,389	59,799	97,471
Number of common stock shares purchased	173,956	144,457	205,983
Common stock	$ 1.13	$ 1.03	$ 0.93
Common Stock [Member]
Number of shares of common stock issued under stock option plan	48,389	59,799	97,471
Additional Paid-in Capital [Member]
Number of shares of common stock issued under stock option plan	48,389	59,799	97,471
Treasury Stock [Member]
Number of common stock shares purchased	173,956	144,457	205,983

X

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Aggregate dividends paid during the period for each share of common stock outstanding.

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