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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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- Definition

Represents the amount of working capital liabilities assumed at the acquisition date.

+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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