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Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill, Ending Balance	$ 130,410	$ 116,304	$ 109,818
Goodwill, Impairment Loss	0	0
Impairment of Intangible Assets, Finite-lived	$ 0	1,431	$ 0
Acquisition of Non-exclusive Land Easement		100
Customer Relationship [Member]
Impairment of Intangible Assets, Finite-lived		$ 1,400
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	83.00%
Network Access Services [Member]
Goodwill, Ending Balance	$ 22,700
Goodwill Percentage Related to Operating Segments	17.00%

X

- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire non-exclusive land easement.

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

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- 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

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- 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

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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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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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