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Note 5 - Goodwill and Other Intangible Assets - Acquired Intangible Assets by Major Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balances | $ 57,654 | $ 49,395 |  |
Acquisition |  | 91 |  |
Additions to/(disposals from) domain portfolio, net | (17) | (114) | $ (341) | [1]
Amortization expense | (11,420) | (10,333) | (9,243) | [1]
Impairment of definite life intangible asset | (1,431) | 0 | 0 | [1]
Other | (223) |  |  |
Write-down of Ting Mobile customer relationships | (2,581) |  |  |
Acquisition of Network rights | 72 |  |  |
Balances | 47,444 | 57,654 | 49,395 |
Ascio Technologies, Inc. [Member] |  |  |  |
Acquisition |  | 15,140 |  |
FreedomPop and Unreal Mobile [Member] |  |  |  |
Acquisition |  | 3,475 |  |
Cedar Holdings Group, Incorporated [Member] |  |  |  |
Acquisition | 5,390 |  |  |
Brand [Member] |  |  |  |
Balances | 9,091 | 9,004 |  |
Amortization expense | (2,070) | (2,003) |  |
Balances | 7,021 | 9,091 | 9,004 |
Brand [Member] | Ascio Technologies, Inc. [Member] |  |  |  |
Acquisition |  | 2,090 |  |
Customer Relationships [Member] |  |  |  |
Balances | 34,269 | 27,290 |  |
Acquisition |  | 91 |  |
Amortization expense | (8,010) | (7,197) |  |
Impairment of definite life intangible asset | (1,431) |  |  |
Other | (223) |  |  |
Write-down of Ting Mobile customer relationships | (2,581) |  |  |
Balances | 26,664 | 34,269 | 27,290 |
Customer Relationships [Member] | Ascio Technologies, Inc. [Member] |  |  |  |
Acquisition |  | 10,610 |  |
Customer Relationships [Member] | FreedomPop and Unreal Mobile [Member] |  |  |  |
Acquisition |  | 3,475 |  |
Customer Relationships [Member] | Cedar Holdings Group, Incorporated [Member] |  |  |  |
Acquisition | 4,640 |  |  |
Technology-Based Intangible Assets [Member] |  |  |  |
Balances | 1,516 | 163 |  |
Amortization expense | (1,242) | (1,087) |  |
Other |  |  |  |
Balances | 274 | 1,516 | 163 |
Technology-Based Intangible Assets [Member] | Ascio Technologies, Inc. [Member] |  |  |  |
Acquisition |  | 2,440 |  |
Network Rights [Member] |  |  |  |
Balances | 469 | 515 |  |
Amortization expense | (98) | (46) |  |
Other |  |  |  |
Acquisition of Network rights | 72 |  |  |
Balances | 1,193 | 469 | 515 |
Network Rights [Member] | Cedar Holdings Group, Incorporated [Member] |  |  |  |
Acquisition | 750 |  |  |
Surname Domain Names [Member] |  |  |  |
Balances | 11,164 | 11,176 |  |
Additions to/(disposals from) domain portfolio, net | (7) | (12) |  |
Balances | 11,157 | 11,164 | 11,176 |
Direct Navigation Domain Names [Member] |  |  |  |
Balances | 1,145 | 1,247 |  |
Additions to/(disposals from) domain portfolio, net | (10) | (102) |  |
Balances | $ 1,135 | $ 1,145 | $ 1,247 |
[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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