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INVESTMENTS IN AFFILIATED AND OTHER COMPANIES (Tables)
12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of investment in affiliated companies
Investment in affiliated companies
 
   
US dollars
 
   
December 31,
 
(in thousands)
 
2017
   
2016
 
Bringg (see 1 below)
   
6,090
     
3,408
 
RTI (see 2 below)
   
4,621
     
8,387
 
IRT (see 2 below)
   
2,734
     
(266
)
IRTA (see 2 below)
   
(301
)
   
446
 
HK (see 2 below)
   
1,695
     
-
 
     
14,839
     
11,975