Note 5 - Investments, Available-for-sale

3 Months Ended

Mar. 31, 2024

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:

	March 31, 2024
										Balance Sheet Classification
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments
	(in thousands)
Corporate bonds	$	995	$	-	$	(1	)	$	994	$	994
Total investments	$	995	$	-	$	(1	)	$	994	$	994

	December 31, 2023
										Balance Sheet Classification
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments
	(in thousands)
Corporate bonds	$	3,981	$	-	$	(10	)	$	3,971	$	3,971
Total investments	$	3,981	$	-	$	(10	)	$	3,971	$	3,971

As of March 31, 2024, 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 months ended March 31, 2024 or 2023.