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Note 10 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Revenues | $ 85,612 | $ 83,519 | $ 81,087 | $ 95,795 | $ 90,621 | $ 85,008 | $ 84,223 | $ 69,568 | $ 346,013 | $ 329,421 | [1] | $ 189,819 | [1]
Network Access Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 97,324 | 89,452 |  | 74,306 |
Domain Name Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 248,689 | 239,969 |  | 115,513 |
Domain Name Services [Member] | Wholesale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 207,190 | 201,563 |  | 97,652 |
Domain Name Services [Member] | Retail Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 34,524 | 31,649 |  | 14,630 |
Domain Name Services [Member] | Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 6,975 | 6,757 |  | 3,231 |
Mobile Services [Member] | Network Access Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 89,340 | 83,885 |  | 70,127 |
Other Services [Member] | Network Access Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 7,984 | 5,567 |  | 4,179 |
Domain Services [Member] | Domain Name Services [Member] | Wholesale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | 189,434 | 183,731 |  | 89,010 |
Value Added Services [Member] | Domain Name Services [Member] | Wholesale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  | $ 17,756 | $ 17,832 |  | $ 8,642 |
[1] | The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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