Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of shares of common stock issued under stock option plan	20,435	48,389	59,799
Number of common stock shares purchased	135,103	173,956	144,457
Common stock	$ 1.250	$ 1.130	$ 1.030
Common Stock [Member]
Number of shares of common stock issued under stock option plan	20,435	48,389	59,799
Additional Paid-in Capital [Member]
Number of shares of common stock issued under stock option plan	20,435	48,389	59,799
Treasury Stock [Member]
Number of common stock shares purchased	135,103	173,956	144,457