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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.

X
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