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Note 5 - Other Receivables, Net (Details Textual)
$ in Thousands, ¥ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Provision for Doubtful Accounts     $ 794 $ (29)      
Internet Advertising And TV Advertising Contractual Deposit [Member]              
Allowance for Doubtful Accounts Receivable, Ending Balance $ 900   900   ¥ 5.8 $ 900 ¥ 5.8
Provision for Doubtful Accounts 0 $ 0 0        
Provision for Doubtful Accounts Reversal 0 $ 0 0 $ 30      
Short-term Working Capital Loan in US Dollars to an Unrelated Third Party [Member]              
Loans Receivable, Net, Total $ 110   $ 110   ¥ 0.7    
Loans Receivable, Interest Rate 12.00%   12.00%   12.00%    
Short-term Working Capital Loan in US Dollars to an Unrelated Third Party Maturing on August 31, 2018 [Member]              
Loans Receivable, Net, Total $ 80   $ 80   ¥ 0.5    
Short-term Working Capital Loan in US Dollars to an Unrelated Third Party, Maturing August 24, 2018 [Member]              
Loans Receivable, Net, Total $ 30   $ 30   ¥ 0.2