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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Revenues $ 175,628 $ 182,127 $ 170,167
Operating income (loss) 40,644 45,870 37,930
Assets 72,699 74,889 76,864
Goodwill 3,356 4,041 5,433 [1]
Expenditures for assets 14,871 13,172 12,576
Depreciation and amortization 8,788 9,068 9,718
Impairment of goodwill and intangible assets [2] 929 922 4,620
Location Based Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 127,683 133,692 126,951
Operating income (loss) 38,328 42,603 38,470
Assets 62,236 63,795 66,300
Goodwill 1,539 1,544 1,730 [1]
Expenditures for assets 14,478 12,574 12,312
Depreciation and amortization $ 8,636 8,920 9,360
Impairment of goodwill and intangible assets 34 2,816
Wireless Communications Products [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 47,945 48,435 43,216
Operating income (loss) 2,316 3,267 (540)
Assets 10,463 11,094 10,564
Goodwill 1,817 2,497 3,703 [1]
Expenditures for assets 393 598 264
Depreciation and amortization 152 148 358
Impairment of goodwill and intangible assets $ 929 $ 888 $ 1,804
[1] The accumulated amount of impairment loss as of December 31, 2013, December 31, 2014 and December 31, 2015 was US$ 5,545,000, US$ 6,424,000 and US$ 7,098,000, respectively.
[2] See Notes 7, 8 and 1N.