XML 42 R31.htm IDEA: XBRL DOCUMENT v3.26.1
Note 9 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

March 31, 2026

  

Total

 

Level 1

 

Level 2

 

Level 3

Money market funds

 $130,786  $130,786  $-  $- 

Certificates of deposit

  304,179   -   304,179   - 

Auction-rate securities backed by student-loan notes

  49   -   -   49 

Mutual funds and money market funds under deferred compensation plan

  75,231   75,231   -   - 

Total

 $510,245  $206,017  $304,179  $49 
  

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