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Note 6 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

Level 3

 

June 30, 2025

   

December 31, 2024

 

Notes Warrants

  $ 107     $ 197  

Additional Warrants

    14       27  

Total

  $ 121     $ 224  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Notes

   

Additional

         
   

Warrants

   

Warrants

   

Total

 

Measurement at December 31, 2024

  $ 197     $ 27     $ 224  

Change in fair value

  $ (107 )   $ (16 )   $ (123 )

Measurement at March 31, 2025

  $ 90     $ 11     $ 101  

Change in fair value

  $ 17     $ 3     $ 20  

Measurement at June 30, 2025

  $ 107     $ 14     $ 121  
   

Notes

   

Additional

         
   

Warrants

   

Warrants

   

Total

 

Measurement at December 31, 2023

  $ 334     $ 263     $ 597  

Change in fair value

  $ 28     $ (214 )   $ (186 )

Measurement at March 31, 2024

  $ 362     $ 49     $ 411  

Change in fair value

  $ (24 )   $ (18 )   $ (42 )

Measurement at June 30, 2024

  $ 338     $ 31     $ 369