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LIABILITY FOR EMPLOYEE RIGHTS UPON RETIREMENT (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Employee severance obligation payments | $ 121,000 | $ 143,000 | $ 145,000
Contributions | 747,000 | 642,000 | 620,000
Severance expense | 885,000 | 784,000 | 781,000
Gain for the period | 28,000 | $ 58,000 | $ 46,000
Benefits Payable During Next Five Years | $ 73,000 |  |
Number of benefit eligible employees | employee | 3 |  |
Contribution to Insurance Companies [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 975,000 |  |
Contribution to Defined Contribution Plans [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 864,000 |  |

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