Note 4 - Accounts Receivable, Net - Accounts Receivable, Net (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Accounts receivable		$ 6,654	$ 6,408
Allowance for doubtful accounts		(4,247)	(3,148)
Accounts receivable, net	[1]	$ 2,407	$ 3,260

[1] All of the VIEs' assets can be used to settle obligations of their primary beneficiary. Liabilities recognized as a result of consolidating these VIEs do not represent additional claims on the Company's general assets (Note 2).