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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Net Income Used in Earnings Per Share | During the periods, there were no potential instruments that could be exercised or converted to ordinary shares. The net income and the weighted average number of shares used in computing basic and diluted earnings per share for the years ended December 31, 2017, 2016 and 2015, are as follows:
|  | US dollars |
|  | Year ended December 31, |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Net income attributable to stockholder's used for the computation of basic and diluted earnings per share |  |  | 43,794 |  |  |  | 32,139 |  |  |  | 24,971 |
Schedule of Weighted Average Shares Used in Earnings Per Share |
|  | Number of shares |
|  | Year ended December 31, |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average number of shares used in the computation of basic and diluted earnings per share |  |  | 20,968 |  |  |  | 20,968 |  |  |  | 20,968 |

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- Definition Tabular disclosure of the calculations of the numerator in earnings per share. + References No definition available. + Details
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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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