Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019				December 31, 2018
Marketable Securities:	Fair Value Hierarchy	Cost		Fair Value		Cost		Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	—	$	—	$	250	$	248
with unrecognized losses for more than 12 months		4,012		3,991		3,861		3,812
with unrecognized gains		—		—		—		—
Total Certificates of deposit	Level 1	4,012		3,991		4,111		4,060
U.S. Treasury and agency notes
with unrecognized losses for less than 12 months		4,064		4,058		3,112		3,105
with unrecognized losses for more than 12 months		19,472		19,391		23,564		23,415
with unrecognized gains		2		3		3		4
Total U.S. Treasury and agency notes	Level 2	23,538		23,452		26,679		26,524
Corporate notes
with unrecognized losses for less than 12 months		14,780		14,760		13,696		13,665
with unrecognized losses for more than 12 months		9,383		9,334		12,542		12,431
with unrecognized gains		1,795		1,797		—		—
Total Corporate notes	Level 2	25,958		25,891		26,238		26,096
Municipal notes
with unrecognized losses for less than 12 months		—		—		2,994		2,982
with unrecognized losses for more than 12 months		6,949		6,936		4,116		4,087
with unrecognized gains		—		—		—		—
Total Municipal notes	Level 2	6,949		6,936		7,110		7,069
		$	60,457	$	60,270	$	64,138	$	63,749

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, 2019
($ in thousands)	2019		2020		2021		Total
Certificates of deposit	$	2,212	$	1,799	$	—	$	4,011
U.S. Treasury and agency notes	13,414		10,173		—		23,587
Corporate notes	11,871		13,700		400		25,971
Municipal notes	4,951		2,000		—		6,951
	$	32,448	$	27,672	$	400	$	60,520

	December 31, 2018
($ in thousands)	2019		2020		2021		Total
Certificates of deposit	$	2,311	$	1,799	$	—	$	4,110
U.S. Treasury and agency notes	17,574		9,174		—		26,748
Corporate notes	18,671		7,150		400		26,221
Municipal notes	5,111		2,000		—		7,111
	$	43,667	$	20,123	$	400	$	64,190