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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Goodwill, Ending Balance	$ 115,837		$ 109,818
Goodwill, Impairment Loss	$ 0	$ 0
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	2 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Domain Services Operating Segment [Member]
Goodwill, Ending Balance	$ 107,700
Goodwill Percentage Related to Operating Segments	93.00%
Network Access Services [Member]
Goodwill, Ending Balance	$ 8,100
Goodwill Percentage Related to Operating Segments	7.00%

X

- Definition

Represents the percentage of goodwill in relation to the company's operating segments.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-SubTopic 20
-Section 45
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-SubTopic 20
-Section 45
-Paragraph 1
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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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- Details

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- Details

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