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Note 10 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

March 31, 2025

  

Total

 

Level 1

 

Level 2

 

Level 3

Money market funds

 $260,303  $260,303  $-  $- 

Certificates of deposit

  179,117   -   179,117   - 

Corporate debt securities

  3,247   -   3,247   - 

U.S. treasuries and government agency bonds

  206,946   -   206,946   - 

Auction-rate securities backed by student-loan notes

  99   -   -   99 

Mutual funds and money market funds under deferred compensation plan

  65,777   65,777   -   - 

Total

 $715,489  $326,080  $389,310  $99 
  

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