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Note 10 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

June 30, 2025

  

Total

 

Level 1

 

Level 2

 

Level 3

Money market funds

 $372,582  $372,582  $-  $- 

Certificates of deposit

  181,384   -   181,384   - 

U.S. treasuries and government agency bonds

  177,311   -   177,311   - 

Auction-rate securities backed by student-loan notes

  74   -   -   74 

Mutual funds and money market funds under deferred compensation plan

  68,721   68,721   -   - 

Total

 $800,072  $441,303  $358,695  $74 
  

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