XML 95 R79.htm IDEA: XBRL DOCUMENT v3.8.0.1
SEGMENT REPORTING (Schedule of Segment Reporting Infomation by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues $ 234,636 $ 199,574 $ 175,628
Operating income 56,535 47,998 40,644
Assets 112,576 100,570 72,699
Goodwill 3,777 3,406 3,356 [1]
Expenditures for assets 10,027 9,331 14,871
Depreciation and amortization 10,358 9,160 8,788
Impairment of goodwill and intangible assets 929
Location Based Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 169,752 141,940 127,683
Operating income 55,012 44,045 37,268
Assets 95,384 84,777 62,236
Goodwill 1,732 1,562 1,539 [1]
Expenditures for assets 9,346 9,063 14,478
Depreciation and amortization 10,030 8,980 8,636
Impairment of goodwill and intangible assets    
Wireless Communications Products [Member]      
Segment Reporting Information [Line Items]      
Revenues 64,884 57,634 47,945
Operating income 1,523 3,953 3,376
Assets 17,192 15,793 10,463
Goodwill 2,045 1,844 1,817 [1]
Expenditures for assets 681 268 393
Depreciation and amortization $ 328 $ 180 152
Impairment of goodwill and intangible assets     $ 929
[1] The accumulated amount of goodwill impairment loss as of December 31, 2017, 2016 and 2015 was US$ 7,098,000.