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Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 16, 2018 | Sep. 19, 2017 | Jan. 20, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill, Ending Balance |  |  |  | $ 90,054 | $ 90,054 |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  | 111 | [1] | $ 43 | [1]
Finite-lived Intangible Assets Acquired |  |  |  | $ 565 | 320 |  |  |
Brand [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 7 years |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |
Technology-Based Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 2 years |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 7 years |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 565 | $ 320 |  |  |
eNom, Incorporated [Member] |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  | $ 69,048 |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 44,300 |  |  |
eNom, Incorporated [Member] | Brand [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 7 years |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 12,400 |  |  |
eNom, Incorporated [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 2 years |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 3,900 |  |  |
eNom, Incorporated [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 7 years |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 28,000 |  |  |
Otono, Networks Inc. [Member] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 2,623 |  |  |
Business Acquisition, Working Capital Liabilities Assumed |  | $ 1,400 |  |  |  |  |  |
Otono, Networks Inc. [Member] | Brand [Member] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |
Otono, Networks Inc. [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |
Otono, Networks Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 7 years |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 2,600 |  |  | 2,623 |  |  |
TPO [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | $ 400 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 2 years |  |  |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 15 years |  |  |  |
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 7 years |  |  |  |
Domain Name Services [Member] |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  | $ 100 |  | $ 100 |
Domain Services Operating Segment [Member] |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 88,000 |  |  |  |
Goodwill Percentage Related to Operating Segments |  |  |  | 98.00% |  |  |  |
Network Access Services [Member] |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 2,100 |  |  |  |
Goodwill Percentage Related to Operating Segments |  |  |  | 2.00% |  |  |  |
[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.

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