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Note 5 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Cayman Islands |  |  | 489 |  |  |  | 894 |  |  |  | 2,045 |
U.S. |  |  | 5,921 |  |  |  | 9,840 |  |  |  | 80,008 |
PRC |  |  | 1,642 |  |  |  | 1,338 |  |  |  | 11,341 |
BVI |  |  | - |  |  |  | - |  |  |  | 2,498 |
Australia |  |  | - |  |  |  | 473 |  |  |  | 496 |
Net loss before income taxes |  |  | 8,052 |  |  |  | 12,545 |  |  |  | 96,388 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Net loss before income taxes |  |  | 8,052 |  |  |  | 12,545 |  |  |  | 96,388 |
Expected income tax benefit |  |  | 2,818 |  |  |  | 4,391 |  |  |  | 33,736 |
Tax rate differential |  |  | 297 |  |  |  | 581 |  |  |  | 5,796 |
Non-deductible expenses |  |  | (351 | ) |  |  | (152 | ) |  |  | (25,299 | )
Deemed disposal gain* |  |  | - |  |  |  | - |  |  |  | (10,506 | )
Impact of U.S. statutory tax rate change |  |  | - |  |  |  | - |  |  |  | (2,943 | )
Non-taxable income |  |  | - |  |  |  | - |  |  |  | 227 |
Others |  |  | 28 |  |  |  | (63 | ) |  |  | 74 |
Change in valuation allowance |  |  | (2,792 | ) |  |  | (4,757 | ) |  |  | (1,085 | )
Total income tax benefit |  |  | - |  |  |  | - |  |  |  | - |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2016 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  | 8,317 |  |  |  | 7,244 |
Intangible asset |  |  | 428 |  |  |  | 329 |
Deferral of tax deduction of R&D expense |  |  | 409 |  |  |  | 1,239 |
Share based compensation |  |  | - |  |  |  | 1,427 |
Less: valuation allowance |  |  | (9,154 | ) |  |  | (10,239 | )
Net deferred tax assets |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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