Dividends Payable (Details) (USD $)	3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 5% preferred stock	Mar. 31, 2013 Series 2 preferred stock and series 3 preferred stock item	Apr. 30, 2013 Series 2 preferred stock and series 3 preferred stock	Mar. 31, 2013 Series 2 5% preferred stock	Mar. 31, 2013 Series 3 5% preferred stock
Dividends Payable
Preferred stock dividends accrued during the period	$ 37,000	$ 38,000		$ 14,000			$ 14,000	$ 9,000
Accrued and unpaid dividends	317,000		279,000
Dividend rate (as a percent)				5.00%			2.50%	3.50%
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