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.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill, Ending Balance	$ 116,304		$ 116,304		$ 116,304
Goodwill, Impairment Loss	0	$ 0	$ 0	$ 0
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			2 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			15 years
Fiber Internet Services [Member]
Goodwill, Ending Balance	$ 8,600		$ 8,600
Goodwill Percentage Related to Operating Segments	7.00%		7.00%
Mobile Services [Member]
Goodwill, Ending Balance	$ 0		$ 0
Goodwill Percentage Related to Operating Segments	0.00%		0.00%
Domain Services Operating Segment [Member]
Goodwill, Ending Balance	$ 107,700		$ 107,700
Goodwill Percentage Related to Operating Segments	93.00%		93.00%