Note 8 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Marketable Securities [Table Text Block]

	March 31, 2024
(In thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Marketable securities
Corporate and municipal debt securities	$	5,194	$	115	$	(4	)	$	5,305

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2024				December 31, 2023
(In thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	1,369	$	1,416	$	1,506	$	1,556
Due after one year through three years		3,825		3,889		3,607		3,674
Total	$	5,194	$	5,305	$	5,113	$	5,230