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SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Revenues $ 199,574 $ 175,628 $ 182,127
Operating income 47,998 40,644 45,870
Assets 100,570 72,699 74,889
Goodwill 3,406 3,356 4,041
Expenditures for assets 9,331 14,871 13,172
Depreciation and amortization 9,160 8,788 9,068
Impairment of goodwill and intangible assets [1] 929 [1] 922
Location Based Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 141,940 127,683 133,692
Operating income 45,747 38,328 42,603
Assets 84,777 62,236 63,795
Goodwill 1,562 1,539 1,544
Expenditures for assets 9,063 14,478 12,574
Depreciation and amortization 8,980 8,636 8,920
Impairment of goodwill and intangible assets 34
Wireless Communications Products [Member]      
Segment Reporting Information [Line Items]      
Revenues 57,634 47,945 48,435
Operating income 2,251 2,316 3,267
Assets 15,793 10,463 11,094
Goodwill 1,844 1,817 2,497
Expenditures for assets 268 393 598
Depreciation and amortization 180 152 148
Impairment of goodwill and intangible assets $ 929 $ 888
[1] See Notes 7, 8 and 1N.