Note 4 - Accounts Receivable, Net (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	$ 3,376,000		$ 3,376,000		$ 2,793,000
Provision for Doubtful Accounts			1,521,000	$ 1,254,000
Internet Advertising and TV Advertising [Member]
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	$ 3,376,000		3,376,000		$ 2,793,000
Number of Months Past Due	180 days
Provision for Doubtful Accounts		$ 1,300,000	$ 760,000	$ 1,300,000
Provision for Doubtful Accounts Reversal	$ 40,000