Note 5 - Investments, Available-for-sale

6 Months Ended

Jun. 30, 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 accumulated other comprehensive loss in the consolidated balance sheets are as follows:

	June 30, 2023
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commercial Paper	$	2,986	$	-	$	(5	)	$	2,981	$	2,981	$	-
Corporate Bonds		16,025		-		(83	)		15,942		15,942		-
U.S. Treasuries		12,386		-		(5	)		12,381		12,381		-
U.S. Government Agencies		999		-		(6	)		993		993		-
Total Investments	$	32,396	$	-	$	(99	)	$	32,297	$	32,297	$	-

	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

As of June 30, 2023, contractual maturities of available-for-sale investments were one year or less. 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 or six months ended June 30, 2023 or 2022.