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