Note 5 - Investments, Available-for-sale

9 Months Ended

Sep. 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:

	September 30, 2022
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	18,869	$	-	$	(85	)	$	18,784	$	18,784	$	-
Corporate Bonds		55,407		-		(768	)		54,639		53,697		942
U.S. Government Agencies		999		-		(4	)		995		-		995
Total Investments	$	75,275	$	-	$	(857	)	$	74,418	$	72,481	$	1,937

	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:

	September 30, 2022
	(in thousands)
	Amortized Cost		Fair Value
Mature in less than one year	$	73,303	$	72,481
Mature in one to two years		1,972		1,937
Total	$	75,275	$	74,418

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 three and nine months ended September 30, 2022, and 2021, respectively.