Note 5 - Investments, Available-for-sale

6 Months Ended

Jun. 30, 2022

Notes to Financial Statements

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

5. Investments, available-for-sale

The aggregate fair values of investment securities along with unrealized gains and losses determined on an individual investment security basis and included in other comprehensive loss are as follows:

	June 30, 2022
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	35,643	$	-	$	(191	)	$	35,452	$	35,452	$	-
Corporate Bonds		58,242		-		(753	)		57,489		47,908		9,581
Total Investments	$	93,885	$	-	$	(944	)	$	92,941	$	83,360	$	9,581

	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

The following table summarizes the contractual maturities of the Company’s available-for-sale investments:

	June 30, 2022
	(in thousands)
	Amortized Cost		Fair Value
Mature in less than one year	$	84,173	$	83,360
Mature in one to two years		9,712		9,581
Total	$	93,885	$	92,941

Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay certain obligations. There were no sales of investments or gross realized gains or losses for the six months ended June 30, 2022, and 2021, respectively.