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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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Cost of network induced expenses incurred and directly related to good produced and service rendered.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
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