Note 5 - Investments, Available-for-sale

3 Months Ended

Mar. 31, 2023

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 cumulative unrealized gains and losses determined on an individual investment security basis and included in other comprehensive loss are as follows:

	March 31, 2023
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	5,442	$	-	$	(16	)	$	5,426	$	5,426	$	-
Corporate Bonds		29,459		2		(178	)		29,283		28,325		958
U.S. Treasuries		2,953		-		(1	)		2,952		2,952		-
U.S. Government Agencies		999		-		(5	)		994		994		-
Total Investments	$	38,853	$	2	$	(200	)	$	38,655	$	37,697	$	958

	December 31, 2022
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	12,364	$	-	$	(49	)	$	12,315	$	12,315	$	-
Corporate Bonds		55,201		-		(447	)		54,754		50,889		3,865
U.S. Government Agencies		999		-		(8	)		991		991		-
Total Investments	$	68,564	$	-	$	(504	)	$	68,060	$	64,195	$	3,865

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

	March 31, 2023
	(in thousands)
	Amortized Cost		Fair Value
Mature in less than one year	$	37,897	$	37,697
Mature in one to two years		956		958
Total	$	38,853	$	38,655

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 months ended March 31, 2023 or 2022.