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Note 10 - Revenue - Cost of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Cost of revenues | $ 54,501 | $ 59,445 | [1] | $ 123,473 | $ 108,756 | [1]
Network, other costs | 2,701 | 2,261 | [1] | 5,275 | 4,604 | [1]
Cost of revenues | 58,929 | 62,875 | [1] | 132,105 | 115,501 | [1]
Network Expenses [Member] |  |  |  |  |  |
Network, other costs | 2,701 | 2,261 |  | 5,275 | 4,604 |
Network, depreciation and amortization costs | 1,727 | 1,169 |  | 3,357 | 2,141 |
Cost of revenues | 4,428 | 3,430 |  | 8,632 | 6,745 |
Network Access Services [Member] |  |  |  |  |  |
Cost of revenues | 13,268 | 11,648 |  | 25,473 | 22,040 |
Network, other costs | 640 | 410 |  | 1,130 | 951 |
Cost of revenues | 14,822 | 12,558 |  | 28,363 | 23,930 |
Network Access Services [Member] | Mobile Services [Member] |  |  |  |  |  |
Cost of revenues | 11,978 | 10,702 |  | 23,243 | 20,269 |
Network Access Services [Member] | Other Services [Member] |  |  |  |  |  |
Cost of revenues | 1,290 | 946 |  | 2,230 | 1,771 |
Domain Name Services [Member] |  |  |  |  |  |
Cost of revenues | 41,233 | 47,797 |  | 98,000 | 86,716 |
Network, other costs | 2,061 | 1,851 |  | 4,145 | 3,653 |
Cost of revenues | 44,107 | 50,317 |  | 103,742 | 91,571 |
Domain Name Services [Member] | Wholesale [Member] |  |  |  |  |  |
Cost of revenues | 36,592 | 43,064 |  | 88,766 | 78,104 |
Domain Name Services [Member] | Retail Services [Member] |  |  |  |  |  |
Cost of revenues | 4,446 | 4,548 |  | 8,855 | 8,165 |
Domain Name Services [Member] | Portfolio [Member] |  |  |  |  |  |
Cost of revenues | 195 | 185 |  | 379 | 447 |
Domain Name Services [Member] | Domain Services [Member] | Wholesale [Member] |  |  |  |  |  |
Cost of revenues | 35,844 | 42,449 |  | 87,161 | 76,913 |
Domain Name Services [Member] | Value Added Services [Member] | Wholesale [Member] |  |  |  |  |  |
Cost of revenues | $ 748 | $ 615 |  | $ 1,605 | $ 1,191 |
[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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