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Note 6 - Liabilities Related to Sale of Future Royalties (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

Total liability related to sale of future royalties, start of period

 $14,929 

Non-cash royalty revenue paid to HCRP

  (908)

Non-cash interest expense recognized

  1,137 

Total liability related to sale of future royalties, end of period

  15,158 

Current portion

  (3,118)

Long-term portion

 $12,040