Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of available-for-sale securities

The following is a summary of available-for-sale securities at:

($ in thousands)		September 30, 2020				December 31, 2019
Marketable Securities:	Fair Value Hierarchy	Cost		Fair Value		Cost		Fair Value
Certificates of deposit
with unrealized losses for less than 12 months		$	—	$	—	$	251	$	250
with unrealized gains		1,799		1,806		1,799		1,806
Total Certificates of deposit	Level 1	1,799		1,806		2,050		2,056
U.S. Treasury and agency notes
with unrealized losses for less than 12 months		—		—		6,485		6,479
with unrealized gains		5,347		5,360		14,413		14,434
Total U.S. Treasury and agency notes	Level 2	5,347		5,360		20,898		20,913
Corporate notes
with unrealized losses for less than 12 months		1,113		1,112		1,004		1,002
with unrealized gains		3,912		3,920		13,082		13,106
Total Corporate notes	Level 2	5,025		5,032		14,086		14,108
Municipal notes
with unrealized gains		1,999		2,001		1,999		2,007
Total Municipal notes	Level 2	1,999		2,001		1,999		2,007
		$	14,170	$	14,199	$	39,033	$	39,084

Summary of maturities, at par, of marketable securities by year

The following tables summarize the maturities, at par, of marketable securities as of:

	September 30, 2020
($ in thousands)	2020		2021		Total
Certificates of deposit	$	1,799	$	—	$	1,799
U.S. Treasury and agency notes	4,544		802		5,346
Corporate notes	3,050		1,950		5,000
Municipal notes	2,000		—		2,000
	$	11,393	$	2,752	$	14,145

	December 31, 2019
($ in thousands)	2020		2021		Total
Certificates of deposit	$	2,049	$	—	$	2,049
U.S. Treasury and agency notes	20,393		502		20,895
Corporate notes	13,685		400		14,085
Municipal notes	2,000		—		2,000
	$	38,127	$	902	$	39,029