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LIABILITY FOR EMPLOYEE RIGHTS UPON RETIREMENT (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee severance obligation payments | $ 143,000 | $ 145,000 | $ 166,000
Contributions | 642,000 | 620,000 | 746,000
Severance expense | 784,000 | 781,000 | 906,000
Net gain (loss) for the period | 58,000 | $ 46,000 | $ 21,000
Benefits Payable During Next Five Years | 246,000 |  |
Contribution to Insurance Companies [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 866,000 |  |
Contribution to Defined Contribution Plans [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 722,000 |  |

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