Note 7 - Other Current Assets, Net (Details Textual) $ in Thousands, ¥ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)
Accounts Receivable, Credit Loss Expense (Reversal)		$ 445	$ 1,521
Internet Advertising And TV Advertising Contractual Deposit [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance		1,570		¥ 11	$ 1,570	¥ 11
Accounts Receivable, Credit Loss Expense (Reversal)		830
Short-term Working Capital Loan to an Unrelated Third Party [Member]
Financing Receivable, after Allowance for Credit Loss, Total		140		¥ 1	$ 140	¥ 1
Accounts Receivable, Credit Loss Expense (Reversal)		$ 140
Other Receivables [Member]
Accounts Receivable, Credit Loss Expense (Reversal)	$ 760		$ 760