Note 6 - Goodwill and Other Intangible Assets - Acquired Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	[1]
Balances	$ 57,654
Cedar Networks acquisition (Note 4 (b))	5,575
Additions to/(disposals from) domain portfolio, net	(13)	$ (4)
Amortization expense	(3,301)	$ (2,040)
Balances	59,915
Brand [Member]
Balances	9,091
Cedar Networks acquisition (Note 4 (b))
Additions to/(disposals from) domain portfolio, net
Amortization expense	(518)
Balances	8,573
Customer Relationships [Member]
Balances	34,268
Cedar Networks acquisition (Note 4 (b))	4,630
Additions to/(disposals from) domain portfolio, net
Amortization expense	(2,429)
Balances	36,469
Technology-Based Intangible Assets [Member]
Balances	1,516
Cedar Networks acquisition (Note 4 (b))
Additions to/(disposals from) domain portfolio, net
Amortization expense	(327)
Balances	1,189
Network Rights [Member]
Balances	469
Cedar Networks acquisition (Note 4 (b))	945
Additions to/(disposals from) domain portfolio, net
Amortization expense	(27)
Balances	1,387
Surname Domain Names [Member]
Balances	11,166
Cedar Networks acquisition (Note 4 (b))
Additions to/(disposals from) domain portfolio, net	(4)
Amortization expense
Balances	11,162
Direct Navigation Domain Names [Member]
Balances	1,144
Cedar Networks acquisition (Note 4 (b))
Additions to/(disposals from) domain portfolio, net	(9)
Amortization expense
Balances	$ 1,135

[1] The Company has initially applied ASC 2014-09 (Topic 606) on January 1, 2018 and ASC 2016-02 (Topic 842) on January 1, 2019. Both accounting standards were adopted using the modified retrospective method, under this method the comparative periods were not restated.