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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands, ¥ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 CNY (¥)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ (96,388) | $ (12,545) | $ (8,052) |
Retained Earnings (Accumulated Deficit) | (123,891) | (32,128) |  |
Net Cash Provided by (Used in) Operating Activities | (28,796) | (13,698) | (6,570) |
Cash, Cash Equivalents, and Short-term Investments | 30,555 |  |  |
Cash Equivalents, at Carrying Value | 0 | 0 |  |
Short-term Investments | 3,074 |  |  |
Allowance for Doubtful Accounts Receivable | 0 | 0 |  |
Capital Lease Obligations | 0 | 0 | 0 |
Impairment of Long-Lived Asset | $ 0 | 0 | 0 |
Number of Reportable Segments | 1 |  |  |
Revenue, Net | $ 0 | 0 | $ 0 |
Assets | $ 32,828 | $ 14,908 |  |
Depreciation of RMB Against U.S. Dollar, Percent | 6.50% | 6.30% | 4.40% |
Government Grants, Credit to Profit (Loss) | $ 0 |  |  |
UNITED STATES |  |  |  |
Assets | 142 |  |  |
CHINA |  |  |  |
Assets | 2,399 |  |  |
Other Income [Member] |  |  |  |
Revenue from Grants | $ 914 |  |  |
Bank Time Deposits [Member] |  |  |  |
Short-term Investments, Maturity | 1 year |  |  |
Short-term Investments | $ 3,074 |  |  | ¥ 20

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