Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Computation of Weighted Average Number of Common Shares Outstanding for Basic and Diluted Earnings Per Share

The weighted average number of common shares outstanding for basic and diluted earnings per share computations was as follows:

	2017			2016			2015
Weighted average common shares		2,980,602			2,980,602			2,980,602
Average treasury shares		(238,360	)		(238,574	)		(241,132	)
Total weighted average common shares outstanding (basic)		2,742,242			2,742,028			2,739,470
Dilutive effect of assumed exercise of stock options		–			–			2,638
Weighted average common shares outstanding (diluted)		2,742,242			2,742,028			2,742,108