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Note 6 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
  

December 31, 2025

 
  

Fair Value Measurement Category

 
  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

            

Fair value of warrant liabilities

         
  

December 31, 2024

 
  

Fair Value Measurement Category

 
  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

            

Fair value of warrant liabilities

        109 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

December 31, 2025

 

Warrants liabilities as of January 1, 2025

 $109 

Change in fair value of warrants

  (109)

Warrants liabilities as of December 31, 2025

 $