Cumulative Preferred Stock of Subsidiary (Details) (Small Business Investment Company Subsidiaries [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Small Business Investment Company Subsidiaries [Member]
Cumulative Preferred Stock of Subsidiary (Textual) [Abstract]
Shares outstanding	30,000
Par value of shares	$ 100
Percentage of outstanding preferred stock	3.00%
Cost of redeemable preferred stock	$ 3,000,000
Value of redeemed preferred stock	900,000
Dividends	$ 90,000	$ 90,000	$ 90,000