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

9 Months Ended

Sep. 30, 2023

Notes Tables

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

	September 30, 2023
										Balance Sheet Classification
(In thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	-	$	-	$	-		$	-	$	-	$	-
Corporate Bonds		4,960		-		(28	)		4,932		4,932		-
US Treasuries		5,491		-		-			5,491		5,491		-
U.S. Government Agencies		1,000		-		(3	)		997		997		-
Total Investments	$	11,451	$	-	$	(31	)	$	11,420	$	11,420	$	-

	December 31, 2022
										Balance Sheet Classification
(In thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	12,364	$	-	$	(49	)	$	12,315	$	12,315	$	-
Corporate Bonds		55,201		-		(447	)		54,754		50,889		3,865
U.S. Government Agencies		999		-		(8	)		991		991		-
Total Investments	$	68,564	$	-	$	(504	)	$	68,060	$	64,195	$	3,865