Note 6 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Marketable Securities [Table Text Block]

	December 31, 2024
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Marketable securities
Corporate, municipal debt and treasury securities	$	5,254	$	157	$	(1	)	$	5,410

Investments Classified by Contractual Maturity Date [Table Text Block]

	December 31, 2024				December 31, 2023
(in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	1,565	$	1,630	$	1,506	$	1,556
Due after one year through three years		3,689		3,780		3,607		3,674
Total	$	5,254	$	5,410	$	5,113	$	5,230