Note 4 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Revenues	$ 3,531	$ 6,316
Search Engine Marketing and Data Service [Member]
Revenues	3,531	6,161
Online Advertising Placement [Member]
Revenues	0	130
Blockchain-based SaaS services [Member]
Revenues	0	25
Transferred over Time [Member]
Revenues	3,531	6,316
Transferred at Point in Time [Member]
Revenues	$ 0	$ 0

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