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Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill, Ending Balance		$ 116,304	$ 109,818	$ 90,054
Goodwill, Impairment Loss		0	0
Impairment of Intangible Assets, Finite-lived		1,431	0	0	[1]
Acquisition of Non-exclusive Land Easement		100
Customer Relationships [Member]
Impairment of Intangible Assets, Finite-lived		$ 1,431
FreedomPop and Unreal Mobile [Member]
Asset Acquisition, Consideration Transferred	$ 3,500
FreedomPop and Unreal Mobile [Member] | Customer Relationships [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)	3 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		2 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		15 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		7 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		$ 8,618	$ 2,132	$ 2,132
Goodwill Percentage Related to Operating Segments		7.00%
[1] The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2(u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.

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- Definition

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

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