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Note 4 - Investment in Wanchun Pharma (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
     
$
 
Acquisition cost    
2,400
 
Less: negative equity investment in Wanchun Pharma    
(239
)
Less: net assets of Wanchun Pharma (including cash of $1,256)    
(1,347
)
Excess cost allocated to patent of Plinabulin and charged to expenses    
814