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Note 6 - Goodwill and Other Intangible Assets - Acquired Intangible Assets by Major Class (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | [2]
Balances | [1] | $ 49,395 |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Additions to/(disposals from) domain portfolio, net |  | (4) | $ (37)
Amortization expense |  | (2,040) | $ (2,331)
Balances |  | 61,991 |
Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  | 14,640 |
Brand [Member] |  |  |
Balances |  | 9,004 |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Additions to/(disposals from) domain portfolio, net |  |  |
Amortization expense |  | (449) |
Balances |  | 10,575 |
Brand [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  | 2,020 |
Customer Relationships [Member] |  |  |
Balances |  | 27,292 |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Additions to/(disposals from) domain portfolio, net |  |  |
Amortization expense |  | (1,408) |
Balances |  | 36,084 |
Customer Relationships [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  | 10,200 |
Technology-Based Intangible Assets [Member] |  |  |
Balances |  | 163 |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Additions to/(disposals from) domain portfolio, net |  |  |
Amortization expense |  | (171) |
Balances |  | 2,412 |
Technology-Based Intangible Assets [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  | 2,420 |
Network Rights [Member] |  |  |
Balances |  | 515 |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Additions to/(disposals from) domain portfolio, net |  |  |
Amortization expense |  | (12) |
Balances |  | 503 |
Network Rights [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Surname Domain Names [Member] |  |  |
Balances |  | 11,176 |
Additions to/(disposals from) domain portfolio, net |  | (1) |
Amortization expense |  |  |
Balances |  | 11,175 |
Surname Domain Names [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
Direct Navigation Domain Names [Member] |  |  |
Balances |  | 1,245 |
Additions to/(disposals from) domain portfolio, net |  | (3) |
Amortization expense |  |  |
Balances |  | 1,242 |
Direct Navigation Domain Names [Member] | Ascio Technologies, Inc. [Member] |  |  |
Acquisition of Ascio Technologies, Inc. (note 4 (b)) |  |  |
[1] | The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] | The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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