Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Marketable Securities

Schedule for available-for-sale securities

The following is a summary of available-for-sale securities as of September 30, 2018 (in thousands):

	September 30, 2018
		Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	21,366	$	1	$	(69)	$	21,298
Corporate debt securities		41,730		7		(272)		41,465
Variable rate demand notes		8,700		-		-		8,700
Total	$	71,796	$	8	$	(341)	$	71,463

Schedule of maturities of marketable securities

The following table summarizes the maturities of the Company’s marketable securities as of September 30, 2018 (in thousands):  

		September 30, 2018
Due within one year	$	38,139
Due after one year through five years		33,324
Total	$	71,463