Note 4 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

		March 31, 2024							December 31, 2023
	Fair Value Level1	Adjusted Cost		Gross Unrealized Losses			Fair Value		Adjusted Cost		Gross Unrealized Gains (Losses)			Fair Value
Money market funds	Level 1	$	2,927	$	—		$	2,927	$	213	$	—		$	213
Government and municipal debt securities	Level 2		12,299		(4	)		12,295		1,426		1			1,427
Corporate debt securities	Level 2		30,303		(46	)		30,257		45,580		(13	)		45,567
Total investments		$	45,529	$	(50	)	$	45,479	$	47,219	$	(12	)	$	47,207