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RELATED PARTY BALANCES AND TRANSACTIONS (Narrative) (Details) ₪ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 ILS (₪) | Nov. 30, 2017 USD ($) | Nov. 30, 2017 ILS (₪) | Jul. 30, 2017 USD ($) | Jul. 30, 2017 ILS (₪) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 ILS (₪) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ILS (₪) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party debt | $ |  |  |  |  |  |  |  |  |  | $ 1,442 |  |  |
Nistec [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage discount on purchases |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |
Percentage of mark up related to actual price of purchase |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |
Percentage of discount on excess inventory |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |
Percentage of standard discount |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |
Percentage of commission |  |  |  |  |  |  |  |  |  | 14.25% | 14.25% |  |
Percentage of bonus given to officers |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |  |
Proceeds from related party debt | $ |  |  |  |  |  |  |  | $ 1,400 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.60% | 2.60% |  |  |  |
Number of installments |  |  |  |  |  |  |  | 8 | 8 |  |  |  |
Loan term |  |  |  |  |  |  |  | 2 years | 2 years |  |  |  |
Nistec [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party debt | $ | $ 2,500 | $ 1,100 |  |  |  |  |  |  |  |  |  |  |
Nistec [Member] | Bank HaPoalim [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit | $ |  |  |  |  |  | $ 1,300 |  |  |  |  |  |  |
Period of line of credit |  |  |  |  |  | 1 year | 1 year |  |  |  |  |  |
Nistec [Member] | Mizrahi-Tefahot Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party debt | $ |  |  |  | $ 840 |  |  |  |  |  |  |  |  |
Nistec [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchases |  |  |  |  |  |  |  |  |  |  | ₪ 300 |  |
Bonus |  |  |  |  |  |  |  |  |  |  | 200 |  |
Reimbursement expense |  |  |  |  |  |  |  |  |  |  | 10 |  |
Proceeds from related party debt |  |  |  |  |  |  |  |  | ₪ 5,000 |  |  |  |
Nistec [Member] | NIS [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party debt |  |  | ₪ 4,000 |  |  |  |  |  |  |  |  |  |
Nistec [Member] | NIS [Member] | Bank HaPoalim [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit |  |  |  |  |  |  | ₪ 4,500 |  |  |  |  |  |
Nistec [Member] | NIS [Member] | Mizrahi-Tefahot Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from related party debt |  |  |  |  | ₪ 3,000 |  |  |  |  |  |  |  |
Nistec [Member] | NIS [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for lease of car |  |  |  |  |  |  |  |  |  |  | ₪ 250 |  |

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