Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

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)		March 31, 2017				December 31, 2016
Marketable Securities:	Fair Value Hierarchy	Cost		Fair Value		Cost		Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	1,726	$	1,722	$	1,868	$	1,863
with unrecognized losses for more than 12 months		—		—		—		—
with unrecognized gains		3,221		3,229		3,320		3,329
Total Certificates of deposit	Level 1	4,947		4,951		5,188		5,192
US Treasury and agency notes
with unrecognized losses for less than 12 months		1,047		1,045		947		946
with unrecognized losses for more than 12 months		—		—		—		—
with unrecognized gains		761		762		857		859
Total US Treasury and agency notes	Level 2	1,808		1,807		1,804		1,805
Corporate notes
with unrecognized losses for less than 12 months		9,994		9,954		11,658		11,592
with unrecognized losses for more than 12 months		977		972		1,053		1,042
with unrecognized gains		2,964		2,969		3,431		3,435
Total Corporate notes	Level 2	13,935		13,895		16,142		16,069
Municipal notes
with unrecognized losses for less than 12 months		2,016		1,992		2,556		2,526
with unrecognized losses for more than 12 months		270		268		271		269
with unrecognized gains		1,296		1,299		812		814
Total Municipal notes	Level 2	3,582		3,559		3,639		3,609
		$	24,272	$	24,212	$	26,773	$	26,675

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

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

	March 31, 2017
($ in thousands)	2017		2018		2019		2020		Total
Certificates of deposit	$	294	$	4,306	$	324	$	—	$	4,924
U.S. Treasury and agency notes	1,234		444		142		—		1,820
Corporate notes	2,051		7,073		4,421		—		13,545
Municipal notes	735		1,688		1,125		—		3,548
	$	4,314	$	13,511	$	6,012	$	—	$	23,837

	December 31, 2016
($ in thousands)	2017		2018		2019		2020		Total
Certificates of deposit	$	531	$	4,306	$	324	—		$	5,161
U.S. Treasury and agency notes	1,234		444		142		—		1,820
Corporate notes	4,316		7,133		4,232		—		15,681
Municipal notes	840		1,688		1,075		—		3,603
	$	6,921	$	13,571	$	5,773	$	—	$	26,265