Investments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Investments
Fair value of investments	$ 20,995,000		$ 20,995,000		$ 20,478,000
Total investment losses	(601,000)	(139,000)	(429,000)	(7,000)
Investment in FATV
Investments
Fair value of investments	17,197,000		17,197,000		17,110,000
Total investment losses	(55,000)	(130,000)	84,000	30,000
Open commitments to fund portfolio	0		0
Total partnership capital	71,800,000		71,800,000		70,900,000
Share in management fee income	200,000	200,000	300,000	300,000
Employee Investment Funds net of Company's ownership interest
Investments
Fair value of investments	1,228,000		1,228,000		1,218,000
Total investment losses	(20,000)	(9,000)	13,000	(37,000)
Other investments
Investments
Fair value of investments	2,570,000		2,570,000		2,150,000
Total investment losses	$ (526,000)		$ (526,000)