Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current	[1]	$ 2,207		$ 2,207		$ 4,247
Accounts Receivable, Credit Loss Expense (Reversal)				0	$ 747
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current		2,210		$ 2,210		$ 4,250
Number of Months Past Due (Month)				6 months
Accounts Receivable, Credit Loss Expense (Reversal)		0	$ 340	$ 0	$ 750
Accounts Receivable, Allowance for Credit Loss, Writeoff		$ 2,080

[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).