Note 4 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

	December 31, 2024
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Level 2:
U.S. treasury debt securities	$	37,726	$	24	$	(2	)	$	37,748
Total	$	37,726	$	24	$	(2	)	$	37,748

	December 31, 2023
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Level 2:
U.S. treasury debt securities	$	30,791	$	10	$	(1	)	$	30,800
Total	$	30,791	$	10	$	(1	)	$	30,800