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Note 10 - Revenue (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2017 | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Jan. 05, 2018 | Jan. 01, 2018 USD ($)
Contract with Customer, Liability, Total |  | $ 152,051 |  | $ 152,051 |  | $ 160,582 | $ 150,983 |  | $ 160,600
Contract with Customer, Liability, Revenue Recognized | [1] | $ 55,284 |  | 125,253 |  |  |  |  |
Namecheap, Inc. [Member] |  |  |  |  |  |  |  |  |
Domain Name Transfer to Counter Party |  |  |  |  |  |  |  | 2,650,000 |
Contract with Customer, Liability, Revenue Recognized |  |  |  | $ 14,600 |  |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |
Number of Customers |  | 0 | 0 | 1 | 0 |  |  |  |
Concentration Risk, Percentage |  |  |  | 11.00% |  |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Customers |  |  |  | 0 |  | 0 |  |  |
[1] | As a result of the bulk transfer of 2.65 million domain names to Namecheap on January 5, 2018, recognized revenue for the six months ended June 30, 2018 includes $14.6 million related to previously deferred revenue for these names.

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