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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 2,369 | $ 4,757
Current Income Tax Expense (Benefit) | $ 0 | 0 | 0
Deferred Income Tax Expense (Benefit) | 0 | 0 | $ 0
Unrecognized Tax Benefits | 0 | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | 0 |
Unrecognized Tax Benefits, Period Increase (Decrease) | 0 |  |
Profit or Loss Against the Deferred Tax Assets of Subsidiaries with Cumulative Losses [Member] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 4,757 | 2,792 |
Group’s Additional Investment in Wanchun Pharma [Member] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ (423) |
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 35.00% |  |
Operating Loss Carryforwards | $ 17,853 |  |
Operating Loss Carryforwards, Term | 20 years |  |
Foreign Tax Authority [Member] | Australian Taxation Office [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 30.00% |  |
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 16.50% |  |
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 25.00% |  |
Operating Loss Carryforwards | $ 648 |  |
Operating Loss Carryforwards, Term | 5 years |  |
Operating Loss Carryforwards, Amount Expire in 2020 | $ 617 |  |

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