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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).

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