XML 31 R18.htm IDEA: XBRL DOCUMENT

Net Income Per Share of Common Stock	12 Months Ended
Net Income Per Share of Common Stock	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income Per Share of Common Stock	NET INCOME PER SHARE OF COMMON STOCK The computation of net income per share of common stock is based on the average number of common shares outstanding during each year, adjusted in all periods presented for the declaration of a 5% stock dividend declared in 2016 and a 2.5% stock dividend declared in 2015. There was no stock dividend declared in 2014. The average number of shares used in computing net income per share of common stock at December 31, 2016, 2015, and 2014 was 17,385,952, 17,182,663, and 17,056,076, respectively.