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GOODWILL (Schedule Of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Goodwill, beginning balance $ 3,406 $ 3,356 [1]
Translation differences 371 50
Goodwill, ending balance 3,777 3,406
Location Based Services [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 1,562 1,539 [1]
Translation differences 170 23
Goodwill, ending balance 1,732 1,562
Wireless Communications Products [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 1,844 1,817 [1]
Translation differences 201 27
Goodwill, ending balance $ 2,045 $ 1,844
[1] The accumulated amount of goodwill impairment loss as of December 31, 2017, 2016 and 2015 was US$ 7,098,000.