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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of shares of common stock issued under stock option plan | 167,675 | 45,289 | 67,029
Number of common stock shares purchased | 43,835 | 41,915 | 60,595
Common stock | $ 0.78 | $ 0.73 | $ 0.69
Common Stock [Member] |  |  |
Number of shares of common stock issued under stock option plan | 167,675 | 45,289 | 67,029
Additional Paid-in Capital [Member] |  |  |
Number of shares of common stock issued under stock option plan | 167,675 | 45,289 | 67,029
Treasury Stock [Member] |  |  |
Number of common stock shares purchased | 43,835 | 41,915 | 60,595

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