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LIABILITY FOR EMPLOYEE RIGHTS UPON RETIREMENT (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee severance obligation payments | $ 145,000 | $ 166,000 | $ 164,000
Contributions | 620,000 | 746,000 | 675,000
Severance expense | 781,000 | 906,000 | 842,000
Net gain (loss) for the period | 46,000 | $ 21,000 | $ (7,000)
Benefits Payable During Next Five Years | 248,000 |  |
Contribution to Insurance Companies [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 748,000 |  |
Contribution to Defined Contribution Plans [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 604,000 |  |

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