Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

The following is a summary of available-for-sale securities at December 31:



($ in thousands)		2019				2018
Marketable Securities:	Fair Value Hierarchy	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Certificates of deposit
with unrecognized losses for less than 12 months		$	251	$	250	$	250	$	248
with unrecognized losses for more than 12 months		—		—		3,861		3,812
with unrecognized gains		1,799		1,806		—		—
Total Certificates of deposit	Level 1	2,050		2,056		4,111		4,060
U.S. Treasury and agency notes
with unrecognized losses for less than 12 months		6,485		6,479		3,112		3,105
with unrecognized losses for more than 12 months		—		—		23,564		23,415
with unrecognized gains		14,413		14,434		3		4
Total U.S. Treasury and agency notes	Level 2	20,898		20,913		26,679		26,524
Corporate notes
with unrecognized losses for less than 12 months		1,004		1,002		13,696		13,665
with unrecognized losses for more than 12 months		—		—		12,542		12,431
with unrecognized gains		13,082		13,106		—		—
Total Corporate notes	Level 2	14,086		14,108		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		—		—		4,116		4,087
with unrecognized gains		1,999		2,007		—		—
Total Municipal notes	Level 2	1,999		2,007		7,110		7,069

		$	39,033	$	39,084	$	64,138	$	63,749

The following tables summarize the maturities, at par, of marketable securities by year ($ in thousands):