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Note 5 - Other Receivables, Net (Details Textual)
$ in Thousands, ¥ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Internet Advertising And TV Advertising Contractual Deposit [Member]              
Allowance for Doubtful Accounts Receivable, Ending Balance $ 1,600   $ 1,600   ¥ 10.8 $ 900 ¥ 5.8
Provision for Doubtful Accounts Reversal 770 $ 0 770 $ 30      
Fund Advanced to Company Management [Member]              
Loans Receivable, Net, Total $ 200   $ 200