Common Stock and Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Common Stock and Earnings Per Share [Abstract]

Shares Used in Computing Basic and Diluted Net Income per Share

Net income of $12,974, $11,846 and $12,489 for the years ended December 31, 2017, 2016 and 2015 respectively, is used to calculate both basic and diluted earnings per share.  Basic net income per share is based on the weighted average number of common shares outstanding.  Diluted net income per share is based on the weighted average number of common shares outstanding plus potentially dilutive shares.  The dilutive effect of employee stock-based compensation is included in the computation of diluted net income per share.  The dilutive effect of stock-based compensation is calculated using the treasury stock method and expected proceeds upon exercise or issuance of the stock-based compensation.  The following table summarizes the shares used in computing basic and diluted net income per share:

	2017		2016		2015
Weighted average common shares, basic		12,849,123		12,845,955		12,831,687
Effect of dilutive securities:
Employee stock-based compensation		48		18		-
Weighted average common shares, diluted		12,849,171		12,845,973		12,831,687

Under the employee stock purchase plan, all full-time employees who have been employed at least ninety consecutive days may purchase shares of the Company's common stock limited to 10% of gross compensation.  The purchase price is 95% of the fair market value (as defined).  Shares issued during 2017, 2016 and 2015 were 4,770, 5,115 and 7,417, respectively.  As of December 31, 2017, 70,826 authorized shares remain unissued under the plan.