Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of weighted average number of shares outstanding

	Twelve Months Ended December 31,
	2017	2016	2015
Weighted average number of shares outstanding:
Common stock	21,677,981	20,737,903	20,665,792
Common stock equivalents-stock options, grants	40,409	46,839	71,879
Diluted shares outstanding	21,718,390	20,784,742	20,737,671