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BALANCES AND TRANSACTIONS WITH KEY OFFICERS AND CERTAIN SHAREHOLDERS (Schedule of Balances) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Key officers [Member]    
Disclosure of transactions between related parties [line items]    
Receivables
Other payables 468 285
Certain shareholder [Member]    
Disclosure of transactions between related parties [line items]    
Receivables 337 283
Other payables