Note 5 - Investments, Available-for-sale (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	March 31, 2022
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	44,124	$	-	$	(191	)	$	43,933	$	43,933	$	-
Corporate Bonds		50,314		-		(607	)		49,707		34,980		14,727
Total Investments	$	94,438	$	-	$	(798	)	$	93,640	$	78,913	$	14,727

	December 31, 2021
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	50,705	$	-	$	(46	)	$	50,659	$	50,660	$	-
Corporate Bonds		67,239		1		(202	)		67,038		29,602		37,435
Total Investments	$	117,944	$	1	$	(248	)	$	117,697	$	80,262	$	37,435

	March 31, 2022
	(in thousands)
	Amortized Cost		Fair Value
Mature in less than one year	$	79,453	$	78,913
Mature in one to two years		14,985		14,727
Total	$	94,438	$	93,640