Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

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



($ in thousands)		June 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 losses for more than 12 months		—		—		—		—
with unrealized gains		1,799		1,815		1,799		1,806
Total Certificates of deposit	Level 1	1,799		1,815		2,050		2,056
U.S. Treasury and agency notes
with unrealized losses for less than 12 months		—		—		6,485		6,479
with unrealized losses for more than 12 months		—		—		—		—
with unrealized gains		14,630		14,688		14,413		14,434
Total U.S. Treasury and agency notes	Level 2	14,630		14,688		20,898		20,913
Corporate notes
with unrealized losses for less than 12 months		1,583		1,582		1,004		1,002
with unrealized losses for more than 12 months		—		—		—		—
with unrealized gains		7,202		7,233		13,082		13,106
Total Corporate notes	Level 2	8,785		8,815		14,086		14,108
Municipal notes
with unrealized losses for less than 12 months		—		—		—		—
with unrealized losses for more than 12 months		—		—		—		—
with unrealized gains		2,000		2,005		1,999		2,007
Total Municipal notes	Level 2	2,000		2,005		1,999		2,007
		$	27,214	$	27,323	$	39,033	$	39,084

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