Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 4,384	$ 8,567
Search Engine Marketing and Data Service [Member]
Revenues	1,988	6,725
Online Advertising Placement [Member]
Revenues	948	1,831
Sales of Effective Sales Lead Information [Member]
Revenues		6
Data and Technical Services [Member]
Revenues	300	5
Offline Advertising and Marketing Services [Member]
Revenues	503
Technical Solution Services [Member]
Revenues	645
Transferred over Time [Member]
Revenues	3,739	8,561
Transferred at Point in Time [Member]
Revenues	$ 645	$ 6