v3.26.1
Note 2 - Investments and Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Cash, Cash Equivalent, and Investment [Table Text Block]
   

As of December 31, 2025

 
   

Amortized Cost

   

Gross Unrealized
Gains

   

Gross Unrealized
Losses

   

Fair
Value

 

Cash and cash equivalents:

                               

Cash

  $ 414     $     $     $ 414  

Money market funds

    2,521                   2,521  

U.S. government agency securities

    2,959                   2,959  

Total cash and cash equivalents

    5,894                   5,894  

Short-term investments:

                               

U.S. government agency securities

    14,487                   14,487  

Total short-term investments

    14,487                   14,487  

Total cash, cash equivalents and short-term investments

  $ 20,381     $     $     $ 20,381  
   

As of December 31, 2024

 
   

Amortized Cost

   

Gross Unrealized
Gains

   

Gross Unrealized
Losses

   

Fair
Value

 

Cash and cash equivalents:

                               

Cash

  $ 364     $     $     $ 364  

Money market funds

    2,632                   2,632  

U.S. government agency securities

    5,867                   5,867  

Total cash and cash equivalents

  $ 8,863     $     $     $ 8,863  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   

As of December 31, 2025

 
   

Fair Value

   

Level I

   

Level II

   

Level III

 

Assets

                               

Money market funds

  $ 2,521     $ 2,521     $     $  

U.S. government agency securities

    17,446             17,446        

Total assets measured at fair value

  $ 19,967     $ 2,521     $ 17,446     $  

Liabilities

                               

Warrant liability

  $ 2,376     $     $     $ 2,376  

Total liabilities measured at fair value

  $ 2,376     $     $     $ 2,376  
   

As of December 31, 2024

 
   

Fair Value

   

Level I

   

Level II

   

Level III

 

Assets

                               

Money market funds

  $ 2,632     $ 2,632     $     $  

U.S. government agency securities

    5,867             5,867        

Total assets measured at fair value

  $ 8,499     $ 2,632     $ 5,867     $  

Liabilities

                               

Warrant liability

  $ 1,061     $     $     $ 1,061  

Total liabilities measured at fair value

  $ 1,061     $     $     $ 1,061  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Year Ended

December 31, 2025

   

Year Ended
December 31, 2024

 

Fair value—beginning of period

 

$

1,061     $ 1,778  

Change in fair value of December 2022 Common Stock Warrants

    1,315       (717

)

Fair value—end of period

 

$

2,376     $ 1,061