Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	September 30, 2021
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized (Loss)			Fair Value		Short-term investments		Long-term investments
Commerical Paper	$	28,712	$	-	$	(12	)	$	28,700	$	28,700	$	-
Corporate Bonds		59,455		-		(41	)		59,414		29,272		30,142
Total Investments	$	88,167	$	-	$	(53	)	$	88,114	$	57,972	$	30,142

	Amortized Cost		Fair Value
Mature in less than one year	$	57,997	$	57,972
Mature in one to two years		30,170	$	30,142
Total	$	88,167	$	88,114