Note 4 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 9,820	$ 6,945	$ 16,136	$ 14,597
Search Engine Marketing and Data Service [Member]
Revenues	9,643	5,775	15,804	12,369
Online Advertising Placement [Member]
Revenues	152	1,170	282	2,228
Blockchain-based SaaS services [Member]
Revenues	25	0	50	0
Transferred over Time [Member]
Revenues	9,795	6,945	16,086	14,597
Transferred at Point in Time [Member]
Revenues	$ 25	$ 0	$ 50	$ 0