Marketable Securities (Details)	6 Months Ended
	Jun. 30, 2015 USD ($) investment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) investment
Schedule of Available-for-sale Securities [Line Items]
Other than temporary impairments of marketable securities	$ 54,000	$ 0
Total number in loss position (investments) | investment	2		2
Less than twelve months - fair values	$ 5,884,000		$ 5,928,000
Less than twelve months - unrealized losses	(150,000)		(106,000)
Twelve months or greater - fair values	7,988,000		8,024,000
Twelve months or greater - unrealized losses	(36,000)		(54,000)
Total Fair Value	13,872,000		13,952,000
Total Unrealized Losses	$ (186,000)		$ (160,000)
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total number in loss position (investments) | investment	2		2
Less than twelve months - fair values	$ 5,884,000		$ 5,928,000
Less than twelve months - unrealized losses	(150,000)		(106,000)
Twelve months or greater - fair values	7,988,000		8,024,000
Twelve months or greater - unrealized losses	(36,000)		(54,000)
Total Fair Value	13,872,000		13,952,000
Total Unrealized Losses	$ (186,000)		$ (160,000)