Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 11,900	$ 12,304	$ 34,847	$ 27,104
Search Engine Marketing and Data Service [Member]
Revenues	9,648	8,706	28,613	18,004
Online Advertising Placement [Member]
Revenues	2,125	2,429	5,720	5,679
Data and Technical Services [Member]
Revenues	0	300	0	900
Offline Advertising and Marketing Services [Member]
Revenues	127	269	514	1,276
Technical Solution Services [Member]
Revenues	0	600	0	1,245
Transferred over Time [Member]
Revenues	11,900	11,704	34,847	25,859
Transferred at Point in Time [Member]
Revenues	$ 0	$ 600	$ 0	$ 1,245