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Note 5 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
    

December 31, 2024

  

December 31, 2023

 
  

Fair Value Level1

 

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

  

Adjusted Cost

  

Gross Unrealized Gains (Losses)

  

Fair Value

 

Money market funds

 

Level 1

 $2,092  $  $2,092  $213  $  $213 

Municipal debt securities

 

Level 2

  3,458      3,458   1,426   1   1,427 

Corporate debt securities

 

Level 2

  30,491   (26)  30,465   45,580   (13)  45,567 

Total investments

   $36,041  $(26) $36,015  $47,219  $(12) $47,207