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Note 7 - Liabilities Related to Sale of Future Royalties (Tables)
 12 Months Ended
Dec. 31, 2023
Notes Tables  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

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

 $5,716 

Non-cash royalty revenue paid to HCRP

  (737)

Non-cash interest expense recognized

  1,447 

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

  6,426 

Current portion

  (3,803)

Long-term portion

 $2,623