Note 4 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 7,216	$ 11,900	$ 21,813	$ 34,847
Search Engine Marketing and Data Service [Member]
Revenues	6,236	9,648	18,605	28,613
Online Advertising Placement [Member]
Revenues	980	2,125	3,208	5,720
Offline Advertising and Marketing Services [Member]
Revenues	$ 0	$ 127	$ 0	$ 514