Note 4 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 6,420	$ 9,820	$ 9,951	$ 16,136
Search Engine Marketing and Data Service [Member]
Revenues	5,670	9,643	9,201	15,804
Online Advertising Placement [Member]
Revenues	0	152	0	282
Blockchain-based SaaS services [Member]
Revenues	750	25	750	50
Transferred over Time [Member]
Revenues	5,670	9,795	9,201	16,086
Transferred at Point in Time [Member]
Revenues	$ 750	$ 25	$ 750	$ 50

Amount, excluding 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.

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+ Details