Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Current	$ 3,504		$ 3,148
Accounts Receivable, Credit Loss Expense (Reversal)	410	$ 192
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current	$ 3,500		$ 3,150
Number of Months Past Due (Month)	180 days
Accounts Receivable, Credit Loss Expense (Reversal)	$ 410	$ 190