Note 7 - Other Current Assets, Net (Details Textual) $ in Thousands, ¥ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)
Accounts Receivable, Credit Loss Expense (Reversal)	$ 460	$ 794
Internet Advertising And TV Advertising Contractual Deposit [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance	1,610		¥ 11	$ 1,610	¥ 11
Accounts Receivable, Credit Loss Expense (Reversal)	850
Short-term Working Capital Loan to an Unrelated Third Party [Member]
Financing Receivable, after Allowance for Credit Loss, Total	150		¥ 1	$ 150	¥ 1
Accounts Receivable, Credit Loss Expense (Reversal)	$ 150