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Note 8 - Liability Related to Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Other Liabilities [Table Text Block]
   
Year ended
December 31,
201
9
    
Period from

inception to
December 31,
201
9
  
Liability related to sale of future royalties — beginning balance
   $
93,679
     $
—
  
Proceeds from sale of future royalties
    
—
      
61,184
  
Non-cash royalty revenue
    
(307
)
    
(684
)
Non-cash interest (income) expense recognized
    
(1,337
)
    
31,535
  
Liability related to sale of future royalties as of December 31, 2019
    
92,035
      
92,035
  
Less: current portion
    
(352
)
    
(352
)
Liability related to sale of future royalties — net of current portion
   $
91,683
     $
91,683