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Note 12 - Short-term Bank Loan and Credit Facility (Details Textual)
$ in Thousands, ¥ in Millions
1 Months Ended 12 Months Ended
Jul. 29, 2019
USD ($)
Jul. 29, 2019
CNY (¥)
Jan. 31, 2020
USD ($)
Jan. 31, 2020
CNY (¥)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CNY (¥)
Jan. 31, 2019
USD ($)
Jan. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Oct. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Short-term Bank Loans and Notes Payable [1]                 $ 430 $ 874        
Restricted Cash and Cash Equivalents, Total                   $ 30     $ 30  
Maximum [Member]                            
Short-term Debt, Weighted Average Interest Rate, at Point in Time                 5.655% 5.655%   5.655%   5.655%
Debt Instrument, Basis Spread on Variable Rate                 30.00% 30.00% 30.00%      
Revolving Credit Facility [Member] | Loans Payable [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity                 $ 720 $ 720   ¥ 5.0   ¥ 5.0
Short-term Bank Loans and Notes Payable                 $ 430 440   ¥ 3.0   ¥ 3.0
Repayments of Short-term Debt, Total             $ 440 ¥ 3.0            
Revolving Credit Facility [Member] | Loans Payable [Member] | Subsequent Event [Member]                            
Repayments of Short-term Debt, Total     $ 430 ¥ 3.0                    
Revolving Credit Facility [Member] | Loans Payable Two [Member]                            
Proceeds from Short-term Debt, Total                   $ 440 ¥ 3.0      
Repayments of Short-term Debt, Total $ 220 ¥ 1.5     $ 220 ¥ 1.5                
[1] All of the VIEs' assets can be used to settle obligations of their primary beneficiary. Liabilities recognized as a result of consolidating these VIEs do not represent additional claims on the Company's general assets (Note 2).