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Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 16, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill, Ending Balance |  |  | $ 109,818 | $ 90,054 |
Goodwill, Impairment Loss |  |  | 0 | 0 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  | $ 111
Finite-lived Intangible Assets Acquired |  |  | 91 | 565 |
Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 91 | $ 565 |
TPO [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets Acquired | $ 400 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |  |  |
FreedomPop and Unreal Mobile [Member] |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 3,475 |  |
Asset Acquisition, Consideration Transferred |  | $ 3,500 |  |  |
FreedomPop and Unreal Mobile [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 3,475 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years |  |  |
Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  |
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 7 years |  |
Domain Name Services [Member] |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  | $ 100
Domain Services Operating Segment [Member] |  |  |  |  |
Goodwill, Ending Balance |  |  | $ 107,700 |  |
Goodwill Percentage Related to Operating Segments |  |  | 98.00% |  |
Network Access Services [Member] |  |  |  |  |
Goodwill, Ending Balance |  |  | $ 2,100 |  |
Goodwill Percentage Related to Operating Segments |  |  | 2.00% |  |

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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