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Note 4 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    As of December 31,
    2019   2018
         
Computer equipment and software   $
-
     $
211
  
Furniture, fixtures, and other    
-
      
365
  
Laboratory equipment    
-
      
514
  
     
-
      
1,090
  
Accumulated depreciation    
-
      
(827
 )
Property and equipment, net   $
-
     $
263