Note 2 - Investments in Bond Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Debt Securities, Held-to-Maturity [Table Text Block]

	2023		2022
	(in thousands)
Amortized cost	$	3,135	$	2,983
Unrealized gains		4		9
Fair value	$	3,139	$	2,992

Investments Classified by Contractual Maturity Date [Table Text Block]

	2023				2022
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(in thousands)
One year or less	$	2,671	$	2,671	$	2,432	$	2,440
Greater than one year through five years		464		468		551		552
	$	3,135	$	3,139	$	2,983	$	2,992