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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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