Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 10,416	$ 15,453	$ 14,800	$ 24,020
Search Engine Marketing and Data Service [Member]
Revenues	7,310	11,855	9,298	18,580
Online Advertising Placement [Member]
Revenues	2,302	3,575	3,250	5,406
Sales of Effective Sales Lead Information [Member]
Revenues		23		29
Data and Technical Services [Member]
Revenues	300		600	5
Offline Advertising and Marketing Services [Member]
Revenues	504		1,007
Technical Solution Services [Member]
Revenues			645
Transferred over Time [Member]
Revenues	10,416	15,430	14,155	23,991
Transferred at Point in Time [Member]
Revenues		$ 23	$ 645	$ 29