Note 4 - Accounts Receivable, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	$ 3,393,000	$ 2,793,000
Provision for Doubtful Accounts	1,523,000	1,462,000
Allowance for Doubtful Accounts Receivable, Write-offs		1,410,000
Internet Advertising and TV Advertising [Member]
Allowance for Doubtful Accounts Receivable, Current, Ending Balance	$ 3,393,000	2,793,000
Number of Months Past Due	180 days
Provision for Doubtful Accounts	$ 760,000	1,280,000
Allowance for Doubtful Accounts Receivable, Write-offs		$ 1,410,000