Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss, Current	$ 1,373		$ 1,373		$ 3,393
Accounts Receivable, Credit Loss Expense (Reversal)			460	$ 794
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current	1,400		$ 1,400		$ 3,400
Number of Months Past Due			180 days
Accounts Receivable, Credit Loss Expense (Reversal)	$ 270	$ 310	$ 460	$ 800
Accounts Receivable, Allowance for Credit Loss, Writeoff			$ 2,500