Note 5 - Investments, Available-for-sale

12 Months Ended

Dec. 31, 2021

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 income are as follows:

	December 31, 2021
	(in thousands)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value		Short-term investments		Long-term investments
Commerical 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, as of December 31, 2021:

	Amortized Cost		Fair Value
Mature in less than one year	$	80,336	$	80,262
Mature in one to two years		37,608		37,435
Total	$	117,944	$	117,697

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 for the years ended December 31, 2021, 2020 and 2019, respectively. The Company recorded an immaterial amount of gross realized losses for the year ended December 31, 2021 related to the maturity of investments.