Note 8 - Marketable Securities

12 Months Ended

Dec. 31, 2019

Notes to Financial Statements

Investment [Text Block]

Note 8 – Marketable Securities

The Company invests in short-term and long-term agency, municipal, corporate and other debt securities. The securities are categorized as held-to-maturity and are recorded at amortized cost. Categorization as held-to-maturity is based on the Company’s ability and intent to hold these securities to maturity. Information regarding the Company’s short-term and long-term marketable securities as of December 31, 2019 and 2018 is as follows:

	December 31, 2019
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government agency securities	$	6,274	$	1	$	(7	)	$	6,268
Corporate debt securities		26,944		80		(12	)		27,012
U.S. municipal securities		10,204		9		(3	)		10,210
Commercial paper		3,491		-		-			3,491
Certificates of deposit/time deposits		1,484		22		-			1,506
Total marketable securities	$	48,397	$	112	$	(22	)	$	48,487

	December 31, 2018
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government agency securities	$	16,843	$	-	$	(88	)	$	16,755
Corporate debt securities		31,769		-		(96	)		31,673
U.S. municipal securities		17,509		1		(33	)		17,477
Certificates of deposit/time deposits		4,208		-		(25	)		4,183
Total marketable securities	$	70,329	$	1	$	(242	)	$	70,088

Fair values for the U.S. government agency securities and corporate debt securities are primarily determined based on quoted market prices (Level 1). Fair values for the U.S. municipal securities, commercial paper and certificates of deposit are primarily determined using dealer quotes or quoted market prices for similar securities (Level 2).

The Company tests for other than temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. The investment policy adopted by the Company dictates that only investments in quality, highly rated debt securities are permitted. Those unrealized losses displayed above are the result of macroeconomic factors and are indicative of neither the quality of the underlying security nor the issuer’s ability to pay its debt. The Company intends, and has the ability, to hold the investments to maturity and recover the full principal.

Classification of marketable securities as current or non-current is based upon the security’s maturity date as of the date of these financial statements.

The December 31, 2019 balance of held-to-maturity debt securities by contractual maturity is shown in the following table at amortized cost. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

	December 31,
(in thousands)	2019
Due in one year or less	$	35,437
Due after one year through five years		12,960
Total marketable securities	$	48,397