Marketable Securities (Tables)

6 Months Ended

Jun. 30, 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)		June 30, 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		$	1,241	$	1,238	$	1,868	$	1,863
with unrecognized losses for more than 12 months		—		—		—		—
with unrecognized gains		3,603		3,612		3,320		3,329
Total Certificates of deposit	Level 1	4,844		4,850		5,188		5,192
US Treasury and agency notes
with unrecognized losses for less than 12 months		1,165		1,164		947		946
with unrecognized losses for more than 12 months		—		—		—		—
with unrecognized gains		103		104		857		859
Total US Treasury and agency notes	Level 2	1,268		1,268		1,804		1,805
Corporate notes
with unrecognized losses for less than 12 months		10,750		10,724		11,658		11,592
with unrecognized losses for more than 12 months		1,323		1,318		1,053		1,042
with unrecognized gains		1,182		1,184		3,431		3,435
Total Corporate notes	Level 2	13,255		13,226		16,142		16,069
Municipal notes
with unrecognized losses for less than 12 months		1,836		1,817		2,556		2,526
with unrecognized losses for more than 12 months		519		516		271		269
with unrecognized gains		1,028		1,030		812		814
Total Municipal notes	Level 2	3,383		3,363		3,639		3,609
		$	22,750	$	22,707	$	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:

	June 30, 2017
($ in thousands)	2017		2018		2019		2020		Total
Certificates of deposit	$	195	$	4,306	$	324	$	—	$	4,825
U.S. Treasury and agency notes	692		444		141		—		1,277
Corporate notes	1,724		7,073		4,152		—		12,949
Municipal notes	545		1,688		1,125		—		3,358
	$	3,156	$	13,511	$	5,742	$	—	$	22,409

	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