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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.

X

- 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
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-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

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