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Note 5 - Goodwill and Other Intangible Assets - Acquired Intangible Assets by Major Class (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 19, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balances   $ 58,414 [1] $ 19,973  
Finite-lived intangible assets acquired   565 320  
Additions to/(disposals from) domain portfolio, net   (341) (291) [2] $ (30) [2]
Impairment of indefinite life intangible assets   (111) [2] (43) [2]
Amortization expense   (9,243) (8,400) [2] (953) [2]
Balances   49,395 58,414 [1] 19,973
eNom, Incorporated [Member]        
Finite-lived intangible assets acquired     44,300  
Otono, Networks Inc. [Member]        
Finite-lived intangible assets acquired     2,623  
Brand [Member]        
Balances   10,793 49  
Finite-lived intangible assets acquired    
Additions to/(disposals from) domain portfolio, net    
Amortization expense   (1,789) (1,656)  
Balances   9,004 10,793 49
Brand [Member] | eNom, Incorporated [Member]        
Finite-lived intangible assets acquired     12,400  
Brand [Member] | Otono, Networks Inc. [Member]        
Finite-lived intangible assets acquired      
Customer Relationships [Member]        
Balances   32,185 6,153  
Finite-lived intangible assets acquired   565 320  
Additions to/(disposals from) domain portfolio, net    
Amortization expense   (5,458) (4,911)  
Balances   27,292 32,185 6,153
Customer Relationships [Member] | eNom, Incorporated [Member]        
Finite-lived intangible assets acquired     28,000  
Customer Relationships [Member] | Otono, Networks Inc. [Member]        
Finite-lived intangible assets acquired $ 2,600   2,623  
Technology-Based Intangible Assets [Member]        
Balances   2,113  
Finite-lived intangible assets acquired    
Additions to/(disposals from) domain portfolio, net    
Amortization expense   (1,950) (1,787)  
Balances   163 2,113
Technology-Based Intangible Assets [Member] | eNom, Incorporated [Member]        
Finite-lived intangible assets acquired     3,900  
Technology-Based Intangible Assets [Member] | Otono, Networks Inc. [Member]        
Finite-lived intangible assets acquired      
Network Rights [Member]        
Balances   561 607  
Finite-lived intangible assets acquired    
Additions to/(disposals from) domain portfolio, net    
Amortization expense   (46) (46)  
Balances   515 561 607
Network Rights [Member] | eNom, Incorporated [Member]        
Finite-lived intangible assets acquired      
Network Rights [Member] | Otono, Networks Inc. [Member]        
Finite-lived intangible assets acquired      
Surname Domain Names [Member]        
Balances   11,257 11,295  
Additions to/(disposals from) domain portfolio, net   (81) (38)  
Impairment of indefinite life intangible assets      
Amortization expense    
Balances   11,176 11,257 11,295
Direct Navigation Domain Names [Member]        
Balances   1,505 1,869  
Additions to/(disposals from) domain portfolio, net   (260) (253)  
Impairment of indefinite life intangible assets     (111)  
Amortization expense    
Balances   $ 1,245 $ 1,505 $ 1,869
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.