Investment in Securities, Investments Classified as Available for Sale in Unrealized Loss Position (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) InvestmentHoldinginLossPosition	Jun. 30, 2014 USD ($) InvestmentHoldinginLossPosition	Jun. 30, 2015 USD ($) InvestmentHoldinginLossPosition	Jun. 30, 2014 USD ($) InvestmentHoldinginLossPosition	Dec. 31, 2014 USD ($) InvestmentHoldinginLossPosition
Schedule of Available-for-sale Securities [Line Items]
Unrealized changes to fair value net of taxes included in other comprehensive income	$ (255,000)	$ (1,728,000)	$ (722,000)	$ (4,425,000)
Return of capital on available for sale securities	35,000	238,000	252,000	561,000
Proceeds from sale of investment available for sale	932,000	2,638,000	1,064,000	6,518,000
Gross realized gains on sale of investment available for sale	5,000	1,600,000	30,000	3,200,000
Investments classified as available for sale unrealized loss position [Abstract]
Cost	449,000	0	449,000	0	$ 1,115,000
Unrealized Losses			(62,000)	0	(65,000)
Fair Value	$ 387,000	$ 0	$ 387,000	$ 0	$ 1,050,000
Number of investment holding in loss positions | InvestmentHoldinginLossPosition	3	0	3	0	4
Investment holding impairment period (in months)	10 months				4 months
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 69,000	$ 0	$ 69,000
Closed-end Funds [Member]
Investments classified as available for sale unrealized loss position [Abstract]
Cost	146,000	0	146,000	0	$ 812,000
Unrealized Losses			(28,000)	0	(37,000)
Fair Value	118,000	0	118,000	0	775,000
Mutual Funds [Member]
Investments classified as available for sale unrealized loss position [Abstract]
Cost	303,000	0	303,000	0	303,000
Unrealized Losses			(34,000)	0	(28,000)
Fair Value	$ 269,000	$ 0	$ 269,000	$ 0	$ 275,000