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TAXES ON INCOME (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reduced corporate tax rate in current and next fiscal year 15.00%      
Reduced corporate tax rate in current and next fiscal year if located in certain development zone 10.00%      
Reduced corporate tax rate in fiscal years two and three after current year 12.50%      
Reduced corporate tax rate in fiscal years two and three after current year if located in certain development zone 7.00%      
Reduced corporate tax rate in fiscal years four and thereafter after current year 12.00%      
Reduced corporate tax rate in fiscal years four and thereafter after current year if located in certain development zone 6.00%      
Withholding tax on dividends distributed out of income for Preferred Enterprises 15.00%      
Statutory company tax rate in next fiscal year 25.00%      
Statutory tax rate for next fiscal year 24.00%      
Corporate statutory tax rate on 2018 23.00%      
Tax loss carryforwards   $ 22,500    
Capital losses   4,700    
Income tax expense (benefit) $ 74 1,158 $ 218 $ 1,634
Valuation allowance for deferred tax assets $ 5,256 5,175    
Net change in deferred tax asset valuation allowance   $ 80 $ (2,075) $ (192)
Zone C [Member]        
Tax exemption period on undistributed income, years 2 years      
Maximum [Member]        
Reduced corporate tax rate if foreign investment ownership threshold is reached or exceeded 20.00%