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LIABILITY FOR EMPLOYEE RIGHTS UPON RETIREMENT (Narrative) (Details) - USD ($)	12 Months Ended
	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