Note 3 - Investments (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

	September 30, 2022
	Amortized		Gross unrealized				Estimated
(In thousands)	Cost		Gains		Losses		Fair Value
Available-for-sale securities, current portion
U.S. government securities	$	13,102	$	-	$	48	$	13,054
Corporate debt securities		20,112		-		18		20,094
Other debt securities		1,444		-		9		1,435
Total short-term		34,658		-		75		34,583
Available-for-sale securities, long-term
Other debt securities		490		-		-		490
Total marketable securities	$	35,148	$	-	$	75	$	35,073

	Amortized		Estimated
(In thousands)	Cost		Fair Value
Due in one year or less	$	34,658	$	34,583
Due after one year through five years		490		490
Total	$	35,148	$	35,073