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Note 4 - Acquisitions - Preliminary Purchase Consideration (Details) - USD ($) $ in Thousands	Mar. 18, 2019	Mar. 31, 2019	Dec. 31, 2018
Goodwill		$ 109,777	$ 90,054
Ascio Technologies, Inc. [Member]
Goodwill	$ 19,723
Cash	1,437
Prepaid domain registry fees	10,318
Other assets	2,328
Total assets	48,446
Deferred Revenue	(12,456)
Deferred Tax Liabilities	(3,038)
Other liabilities	(3,491)
Total liabilities	(18,985)
Preliminary consideration paid	29,461
Ascio Technologies, Inc. [Member] \| Brand [Member]
Finite-Lived Intangibles	2,020
Ascio Technologies, Inc. [Member] \| Technology-Based Intangible Assets [Member]
Finite-Lived Intangibles	2,420
Ascio Technologies, Inc. [Member] \| Customer Relationships [Member]
Finite-Lived Intangibles	$ 10,200