Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 6,945	$ 14,551	$ 14,597	$ 22,947
Search Engine Marketing and Data Service [Member]
Revenues	5,775	12,100	12,369	18,965
Online Advertising Placement [Member]
Revenues	1,170	2,193	2,228	3,595
Offline Advertising and Marketing Services [Member]
Revenues	0	258	0	387
Transferred over Time [Member]
Revenues	6,945	14,551	14,597	22,947
Transferred at Point in Time [Member]
Revenues	$ 0	$ 0	$ 0	$ 0