Note 3 - Acquisitions - Preliminary Purchase Consideration (Details) - USD ($) $ in Thousands	Mar. 18, 2019	Jan. 20, 2017	Dec. 31, 2019	Dec. 31, 2018
Goodwill			$ 109,818	$ 90,054
eNom, Incorporated [Member]
Goodwill		$ 69,048
Cash		1,594
Prepaid domain registry fees		70,644
Other assets		10,171
Total assets		195,757
Deferred Revenue		(77,799)
Deferred Tax Liabilities		(24,223)
Other liabilities		(15,903)
Total liabilities		(117,925)
Consideration Paid		77,832
eNom, Incorporated [Member] | Brand [Member]
Finite-Lived Intangibles		12,400
eNom, Incorporated [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangibles		3,900
eNom, Incorporated [Member] | Customer Relationships [Member]
Finite-Lived Intangibles		$ 28,000
Ascio Technologies, Inc. [Member]
Goodwill	$ 19,765
Cash	1,437
Prepaid domain registry fees	10,318
Other assets	2,218
Total assets	48,878
Deferred Revenue	(12,510)
Deferred Tax Liabilities	(2,852)
Other liabilities	(3,630)
Total liabilities	(18,992)
Consideration Paid	29,886
Ascio Technologies, Inc. [Member] | Brand [Member]
Finite-Lived Intangibles	2,090
Ascio Technologies, Inc. [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangibles	2,440
Ascio Technologies, Inc. [Member] | Customer Relationships [Member]
Finite-Lived Intangibles	$ 10,610