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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
   

March 31, 2025

  

December 31, 2024

 
 

Fair Value Level1

 

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

  

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

 

Money market funds

Level 1

 $7,873  $  $7,873  $2,092  $  $2,092 

Municipal debt securities

Level 2

  8,746   (2)  8,744   3,458      3,458 

Corporate debt securities

Level 2

  17,507   (15)  17,492   30,491   (26)  30,465 

Total investments

 $34,126  $(17) $34,109  $36,041  $(26) $36,015