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TAXES ON INCOME (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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% |  |  |

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