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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% |  |  |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2473-110228 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 + Details
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