Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 14,551	$ 10,416	$ 22,947	$ 14,800
Search Engine Marketing and Data Service [Member]
Revenues	12,100	7,310	18,965	9,298
Online Advertising Placement [Member]
Revenues	2,193	2,302	3,595	3,250
Data and Technical Services [Member]
Revenues	0	300	0	600
Offline Advertising and Marketing Services [Member]
Revenues	258	504	387	1,007
Technical Solution Services [Member]
Revenues	0	0	0	645
Transferred over Time [Member]
Revenues	14,551	10,416	22,947	14,155
Transferred at Point in Time [Member]
Revenues	$ 0	$ 0	$ 0	$ 645