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LIABILITY FOR EMPLOYEE RIGHTS UPON RETIREMENT (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee severance obligation payments | $ 166,000 | $ 164,000 | $ 168,000
Contributions | 746,000 | 675,000 | 675,000
Severance expense | 906,000 | 842,000 | 800,000
Net gain (loss) for the period | 21,000 | $ (7,000) | $ (18,000)
Benefits Payable During Next Five Years | 250,000 |  |
Contribution to Insurance Companies [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 830,000 |  |
Contribution to Defined Contribution Plans [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 664,000 |  |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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