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Note 8 - Restructured Debt Liability (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 24, 2025
Jan. 24, 2024
Oct. 27, 2017
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Contingent Milestone Payment, Noncurrent       $ 0   $ 15,000  
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001   $ 0.001  
Gain (Loss) on Extinguishment of Debt       $ 14,520 $ 0    
Common Stock [Member]              
Stock Issued During Period, Shares, New Issues (in shares)       143,000      
Exchange and Termination Agreement with Deerfield Management Company, L.P. [Member]              
Termination Agreement, Payable   $ 200          
Payments for Exchange and Termination Agreement   $ 100          
Stock Issued During Period, Shares, New Issues (in shares)   33,793          
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001          
Exchange and Termination Agreement with Deerfield Management Company, L.P. [Member] | Forecast [Member]              
Payments for Exchange and Termination Agreement $ 100            
Deerfield Loan [Member] | Exchange and Termination Agreement [Member] | Deerfield Management, L.P. [Member]              
Extinguishment of Debt, Amount     $ 25,000        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     10        
Class of Warrant or Right, Exercise Price of Cancelled Warrants (in dollars per share)     $ 2,124,360        
Repayments of Long-term Debt, Total     $ 2,500        
Stock Issued During Period, Shares, Cancellation of Debt and Warrant Obligations (in shares)     27        
Stock Issued During Period, Shares, Cancellation of Debt and Warrant Obligations, Percentage of Fully-diluted Shares Outstanding     2.00%        
Liability for Contingent Milestone Payment, Noncurrent     $ 15,000     $ 15,000 $ 15,000
Deerfield Loan [Member] | Exchange and Termination Agreement [Member] | Deerfield Management, L.P. [Member] | Common Stock [Member]              
Liability for Contingent Milestone Payment, Noncurrent       $ 300      
Deerfield Loan [Member] | Exchange and Termination Agreement [Member] | Deerfield Management, L.P. [Member] | Cash [Member]              
Liability for Contingent Milestone Payment, Noncurrent       $ 200