Note 3 - Summary of Significant Accounting Policies (Details Textual)			3 Months Ended			6 Months Ended
	Aug. 07, 2019 USD ($) $ / shares shares	Jan. 17, 2018 $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Net Income (Loss) Attributable to Parent, Total			$ (379,000)	$ (9,504,000)		$ (1,517,000)	$ (10,069,000)
Cash and Cash Equivalents, at Carrying Value, Ending Balance			1,379,000			1,379,000		$ 3,717,000
Net Cash Provided by (Used in) Operating Activities, Total						(2,325,000)	(4,321,000)
Advertising Expense			0	20,000		0	410,000
Research and Development Expense, Total			$ 159,000	240,000		$ 360,000	458,000
Lessee, Operating Lease, Discount Rate			6.00%			6.00%
Short-term Lease, Cost			$ 130,000
Short-term Lease Liability			118,000			$ 118,000			[1]
Operating Lease, Right-of-Use Asset			17,000			17,000
Operating Lease, Cost			3,000	90,000		88,000	180,000
Lessee, Operating Lease, Liability, Payments, Due, Total			10,000			10,000
Contract with Customer, Performance Obligation Satisfied in Previous Period			0	$ 0			$ 0
Other Current Assets [Member]
Operating Lease, Right-of-Use Asset			17			17
Other Current Liabilities [Member]
Operating Lease, Liability, Total			$ 10			$ 10
Minimum [Member]
Lessee, Operating Lease, Term of Contract			2 years			2 years
Maximum [Member]
Lessee, Operating Lease, Term of Contract			3 years			3 years
CHINA
Number of Lease Offices			2			2
Beijing [Member]
Number of Lease Offices			1			1
Hubei [Member]
Number of Lease Offices			1			1
Private Placement [Member]
Stock Issued During Period, Shares, New Issues | shares		2,150,001
Shares Issued, Price Per Share | $ / shares		$ 5.15
Stock Issued During Period, Value, New Issues					$ 7,988,000
Private Placement [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues | shares	3,216,860
Shares Issued, Price Per Share | $ / shares	$ 1.4927
Stock Issued During Period, Value, New Issues	$ 4,800,000

[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).