Note 4 - Accounts Receivable, Net (Details Textual) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current		$ 2,236	$ 4,247
Accounts Receivable, Credit Loss Expense (Reversal)		0	833
Accounts Receivable, Allowance for Credit Loss, Writeoff		2,090
Internet Advertising and TV Advertising [Member]
Accounts Receivable, Allowance for Credit Loss, Current		2,240	4,250
Number of Months Past Due (Month)	6 months
Accounts Receivable, Credit Loss Expense (Reversal)		830	$ 830
Accounts Receivable, Allowance for Credit Loss, Writeoff		$ 2,090