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Note 7 - Fixed Assets - Components of Fixed Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Cost $ 251,748 $ 233,637
Accumulated depreciation 158,265 149,738
Fixed assets (note 7) 93,483 83,899
Building [Member]    
Cost 2,548 2,425
Accumulated depreciation 1,042 906
Fixed assets (note 7) 1,506 1,519
Vehicles [Member]    
Cost 2,173 1,952
Accumulated depreciation 1,297 1,093
Fixed assets (note 7) 876 859
Furniture and Fixtures [Member]    
Cost 55,952 52,912
Accumulated depreciation 37,751 35,825
Fixed assets (note 7) 18,201 17,087
Computer Equipment [Member]    
Cost 114,136 106,500
Accumulated depreciation 82,120 77,822
Fixed assets (note 7) 32,016 28,678
Leasehold Improvements [Member]    
Cost 76,939 69,848
Accumulated depreciation 36,056 34,092
Fixed assets (note 7) $ 40,883 $ 35,756