Note 13 - Short-term Bank Loan (Details Textual) $ in Thousands, ¥ in Millions				6 Months Ended
		Jul. 13, 2018 USD ($)	Jul. 13, 2018 CNY (¥)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)
Short-term Bank Loans and Notes Payable	[1]			$ 756		$ 765
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%
VIEs [Member]
Short-term Bank Loans and Notes Payable				$ 756		$ 765
VIEs [Member] | Loans Payable [Member]
Short-term Bank Loans and Notes Payable				800	¥ 5	800	¥ 5
VIEs [Member] | Loan Payable Maturing on August 15, 2018 [Member]
Short-term Bank Loans and Notes Payable				500	3	500	3
VIEs [Member] | Loan Payable Maturing on August 15, 2018 [Member] | Subsequent Event [Member]
Repayments of Bank Debt		$ 500	¥ 3
Proceeds from Bank Debt		$ 500
VIEs [Member] | Loan Payable Maturing on October 22, 2018 [Member]
Short-term Bank Loans and Notes Payable				$ 300	¥ 2	$ 300	¥ 2
VIEs [Member] | Loan Payable, Maturing on January 12, 2019 [Member] | Subsequent Event [Member]
Proceeds from Bank Debt | ¥			¥ 3

[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).