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Note 6 - Liabilities Related to Sale of Future Royalties (Tables)
 6 Months Ended
Jun. 30, 2024
Notes Tables  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

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

 $6,426 

Non-cash royalty revenue paid to HCRP

  (3,563)

Non-cash interest expense recognized

  1,414 

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

  4,277 

Current portion

  (2,686)

Long-term portion

 $1,591