Note 5 - Investments, Available-for-sale (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	March 31, 2024
										Balance Sheet Classification
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments
	(in thousands)
Corporate bonds	$	995	$	-	$	(1	)	$	994	$	994
Total investments	$	995	$	-	$	(1	)	$	994	$	994

	December 31, 2023
										Balance Sheet Classification
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments
	(in thousands)
Corporate bonds	$	3,981	$	-	$	(10	)	$	3,971	$	3,971
Total investments	$	3,981	$	-	$	(10	)	$	3,971	$	3,971