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Employees' Rights Upon Retirement (Tables) | 12 Months Ended
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Dec. 31, 2017
Employees' Rights Upon Retirement [Abstract] |
Summary of amounts accrued and the portions funded, with severance pay funds and by the insurance policies |
|  |  | December 31, |
|  |  | 2 0 1 7 |  |  | 2 0 1 6 |
|  |  | U.S. dollars in thousands |
| Accrued severance pay |  | $ | 1,712 |  |  | $ | 1,687 |
| Less - amounts funded (presented in “investment and other non-current assets”) |  |  | (1,642 | ) |  |  | (1,565 | )
| Unfunded balance |  | $ | 70 |  |  | $ | 122 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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