Note 4 - Accounts Receivable, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss, Current	$ 3,148,000	$ 3,393,000
Accounts Receivable, Credit Loss Expense (Reversal)	2,335,000	1,523,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	2,500,000
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current	$ 3,150,000	3,390,000
Number of Months Past Due (Month)	180 days
Accounts Receivable, Credit Loss Expense (Reversal)	$ 2,340,000	$ 760,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 2,500,000