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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