Note 4 - Accounts Receivable, Net (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	$ 3,531,000		$ 3,531,000		$ 2,793,000
Provision for Doubtful Accounts			794,000	$ (29,000)
Internet Advertising and TV Advertising [Member]
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	3,531,000		$ 3,531,000		$ 2,793,000
Number of Months Past Due			180 days
Provision for Doubtful Accounts	$ 330,000	$ 0	$ 800,000	0
Provision for Doubtful Accounts Reversal		$ 0		$ 0