Note 8 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

Marketable Securities [Table Text Block]

	September 30, 2024
(In thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Marketable securities
Corporate, municipal debt and treasury securities	$	5,321	$	190	$	−	$	5,511

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2024				December 31, 2023
(In thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	1,229	$	1,271	$	1,506	$	1,556
Due after one year through three years		4,092		4,240		3,607		3,674
Total	$	5,321	$	5,511	$	5,113	$	5,230