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Note 5 - Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
Surname
domain names
    
Direct
navigation
domain names
    
Brand
    
Customer
relationships
    
Technology
    
Network rights
    
Total
  
Amortization period
  
indefinite life
    
indefinite life
    
7 years
    
3 - 7 years
    
2 years
    
15 years
    
 
  
                                                         
Balances, December 31, 2016
   $
11,295
     $
1,869
     $
49
      
6,153
     $
-
     $
607
     $
19,973
  
Acquisition of Enom (note 3(b))
    
-
      
-
      
12,400
      
28,000
      
3,900
      
-
      
44,300
  
Acquisition of consumer related assets of Otono Networks, Inc.
    
-
      
-
      
-
      
2,623
      
-
      
-
      
2,623
  
Acquisition of customer relationships
    
-
      
-
      
-
      
320
      
-
      
-
      
320
  
Additions to/(disposals from) domain portfolio, net
    
(38
 )    
(253
 )    
-
      
-
      
-
      
-
      
(291
 )
Impairment of indefinite life intangible assets
    
-
      
(111
 )    
-
      
-
      
-
      
-
      
(111
 )
Amortization expense
    
-
      
-
      
(1,656
 )    
(4,911
 )    
(1,787
 )    
(46
 )    
(8,400
 )
Balances December 31, 2017
   $
11,257
     $
1,505
     $
10,793
     $
32,185
     $
2,113
     $
561
      
58,414
  
Acquisition of customer relationships
    
-
      
-
      
-
      
565
      
-
      
-
      
565
  
Additions to/(disposals from) domain portfolio, net
    
(81
 )    
(260
 )    
-
      
-
      
-
      
-
      
(341
 )
Amortization expense
    
-
      
-
      
(1,789
 )    
(5,458
 )    
(1,950
 )    
(46
 )    
(9,243
 )
Balances December 31, 2018
   $
11,176
     $
1,245
     $
9,004
     $
27,292
     $
163
     $
515
     $
49,395
  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
Year ending
December 31,
  
2019
   $
7,488
  
2020
    
7,326
  
2021
    
7,315
  
2022
    
7,187
  
2023
    
7,187
  
Thereafter
    
469
  
Total
   $
36,972