Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current	[1]	$ 4,217		$ 4,247
Accounts Receivable, Credit Loss Expense (Reversal)			$ 410
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current		$ 4,220		$ 4,250
Number of Months Past Due (Month)		180 days
Accounts Receivable, Credit Loss Expense (Reversal)			$ 410

[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).