Note 3 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Advertising Expense	$ 0		$ 0	$ 400
Research and Development Expense, Total	$ 239	$ 264	$ 599	722
Lessee, Operating Lease, Discount Rate	6.00%		6.00%
Short-term Lease, Cost	$ 60		$ 190
Short-term Lease Liability	174		174			[1]
Operating Lease, Right-of-Use Asset	14		14
Operating Lease, Cost	2	$ 90	90	$ 270
Lessee, Operating Lease, Liability, Payments, Due, Total	10		10
Other Current Assets [Member]
Operating Lease, Right-of-Use Asset	14		14
Other Current Liabilities [Member]
Operating Lease, Liability, Total	$ 10		$ 10
Minimum [Member]
Lessee, Operating Lease, Term of Contract	2 years		2 years
Minimum [Member] | Long Term Loan, Business Entities, Collateralized Basis [Member]
Debt Instrument, Term			1 year
Maximum [Member]
Lessee, Operating Lease, Term of Contract	3 years		3 years
Maximum [Member] | Long Term Loan, Business Entities, Collateralized Basis [Member]
Debt Instrument, Term			5 years
CHINA
Number of Lease Offices	2		2
Beijing [Member]
Number of Lease Offices	1		1

[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).