Note 3 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 12,304	$ 15,508	$ 27,104	$ 39,528
Search Engine Marketing and Data Service [Member]
Revenues	8,706	11,554	18,004	30,134
Online Advertising Placement [Member]
Revenues	2,429	3,725	5,679	9,131
Sales of Effective Sales Lead Information [Member]
Revenues		224		253
Data and Technical Services [Member]
Revenues	300	5	900	10
Offline Advertising and Marketing Services [Member]
Revenues	269		1,276
Technical Solution Services [Member]
Revenues	600		1,245
Transferred over Time [Member]
Revenues	11,704	15,284	25,859	39,275
Transferred at Point in Time [Member]
Revenues	$ 600	$ 224	$ 1,245	$ 253