Note 4 - Cash, Cash Equivalents, Investments and Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31,
	2025		2024
Cash	$	969,628	$	679,949
Money market funds		129,674		11,867
Certificates of deposit		157,243		164,418
Corporate debt securities		-		6,712
Auction-rate securities backed by student-loan notes		49		148
Total	$	1,256,594	$	863,094

	December 31,
	2025		2024
Reported as:
Cash and cash equivalents	$	1,099,302	$	691,816
Short-term investments		157,243		171,130
Investment within other long-term assets		49		148
Total	$	1,256,594	$	863,094

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Due in less than 1 year	$	57,179	$	57,179
Due in 1 - 5 years		100,064		100,064
Due in greater than 5 years		50		49
Total	$	157,293	$	157,292