Dividends Payable (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 5% preferred stock	Jun. 30, 2013 5% preferred stock	Jun. 30, 2013 Series 2 preferred stock and series 3 preferred stock item	Jul. 31, 2013 Series 2 preferred stock and series 3 preferred stock	Jun. 30, 2013 Series 2 5% preferred stock	Jun. 30, 2013 Series 2 5% preferred stock	Jun. 30, 2013 Series 3 5% preferred stock	Jun. 30, 2013 Series 3 5% preferred stock
Dividends Payable
Preferred stock dividends accrued during the period	$ 38,000	$ 38,000	$ 75,000	$ 75,000		$ 14,000				$ 14,000		$ 10,000
Accrued and unpaid dividends	357,000		357,000		279,000
Dividend rate (as a percent)							5.00%				5.00%		5.00%
Percentage of additional late fee penalty payable on unpaid dividends								18.00%
Number of outside board members invested in preferred stock								1
Period within which entity must cure breach								45 days
Redemption price									$ 2,200,000