Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Current	$ 4,247	$ 3,148
Accounts Receivable, Credit Loss Expense (Reversal)	833	2,335
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current	$ 4,250	3,150
Number of Months Past Due (Month)	180 days
Accounts Receivable, Credit Loss Expense (Reversal)	$ 830	$ 2,340