Note 8 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

Marketable Securities [Table Text Block]

	June 30, 2024
(In thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Marketable securities
Corporate, municipal debt and treasury securities	$	5,153	$	109	$	(5	)	$	5,257

Investments Classified by Contractual Maturity Date [Table Text Block]

	June 30, 2024				December 31, 2023
(In thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	562	$	586	$	1,506	$	1,556
Due after one year through three years		4,591		4,671		3,607		3,674
Total	$	5,153	$	5,257	$	5,113	$	5,230