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Equity (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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