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Note 12 - Fair Value Measurements (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 14, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 08, 2023
Impairment of Intangible Assets (Excluding Goodwill)         $ 8,300 $ 0  
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]           Asset Impairment Charges  
Stock Issued During Period, Shares, Warrants Exercised (in shares)     367,478        
Tranche B Common Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             2,173,912
Stock Issued During Period, Shares, Warrants Exercised (in shares) 367,478            
Tranche B Pre-Funded Warrants [Member]              
Class of Warrant or Right, Issued During Period (in shares) 1,806,434            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.0001            
Pre-Funded Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   8,233,332     8,233,332    
Class of Warrant or Right, Issued During Period (in shares)   8,233,332     8,233,332 [1],[2]    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.0001     $ 0.0001    
Class of Warrant or Right, Offering Price (in dollars per share)   $ 1.4999     $ 1.4999    
Class of Warrant or Right, Exercised During Period (in shares)       176,000 176,000    
Class of Warrant or Right, Exercise Price, Exercised During Period (in dollars per share)       $ 0.0001      
Fair Value, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]              
Fixed Payment Arrangements, Measurement Input   10.00%     10.00%    
Fair Value, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]              
Fixed Payment Arrangements, Measurement Input   15.40%     15.40%    
[1] From July 2025 through the filing of this report, a total of 935,000 of the June 2025 Prefunded Warrants were exercised to 935,000 shares of common stock. See Note 14 - Stockholders’ Equity for further detail.
[2] Relates to the June 2025 issuance of 8,233,332 prefunded warrants at a public offering price of $1.4999 to purchase 8,233,332 shares of the Company’s common stock at an exercise price of $0.0001 per share.