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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
   

March 31, 2026

  

December 31, 2025

 
 

Fair Value Level1

 

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

  

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

 

Money market funds

Level 1

 $2,852  $  $2,852  $581  $  $581 

Municipal debt securities

Level 2

  1,932      1,932   4,893   (1)  4,892 

Corporate debt securities

Level 2

  11,653   (17)  11,636   17,513   (9)  17,504 

Total investments

 $16,437  $(17) $16,420  $22,987  $(10) $22,977