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Note 5 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

December 31, 2025

  

Total

 

Level 1

 

Level 2

 

Level 3

Money market funds

 $129,674  $129,674  $-  $- 

Certificates of deposit

  157,243   -   157,243   - 

Auction-rate securities backed by student-loan notes

  49   -   -   49 

Mutual funds and money market funds under deferred compensation plan

  75,484   75,484   -   - 

Total

 $362,450  $205,158  $157,243  $49 
  

December 31, 2024

  

Total

 

Level 1

 

Level 2

 

Level 3

Money market funds

 $11,867  $11,867  $-  $- 

Certificates of deposit

  164,418   -   164,418   - 

Corporate debt securities

  6,712   -   6,712   - 

Auction-rate securities backed by student-loan notes

  148   -   -   148 

Mutual funds and money market funds under deferred compensation plan

  65,337   65,337   -   - 

Total

 $248,482  $77,204  $171,130  $148