Note 2 - Investments (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Corporate bonds	$	2,983	$	9	$	-	$	2,992

Investments Classified by Contractual Maturity Date [Table Text Block]

	Held-to-Maturity
	Amortized Cost		Fair Value
	(in thousands)
One year or less	$	2,432	$	2,440
Greater than one year through five years		551		552
	$	2,983	$	2,992