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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Goodwill, Ending Balance	$ 116,270		$ 116,270	$ 116,270			$ 109,818
Goodwill, Impairment Loss	0	$ 0		0	$ 0
Impairment of Intangible Assets, Finite-lived	0	$ 0		$ 1,431	$ 0
Acquisition of Non-exclusive Land Easement			100
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Ting Mobile [Member]
Disposal Group, Including Discontinued Operation, Intangible Assets, Current						$ 2,600
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		$ 107,700	$ 107,700
Goodwill Percentage Related to Operating Segments	93.00%		93.00%	93.00%
Network Access Services [Member]
Goodwill, Ending Balance	$ 8,600		$ 8,600	$ 8,600
Goodwill Percentage Related to Operating Segments	7.00%		7.00%	7.00%

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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- Definition

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

+ References

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- Definition

Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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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 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.

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