Shareholders' Equity (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Shareholders' Equity (Textual)
Common Stock, shares authorized	67,700,000		67,700,000		67,700,000
Excess Stock , shares authorized	5,000,000		5,000,000		5,000,000
Dividend per Share	$ (0.05)	$ (0.03)	$ (0.10)	$ (0.05)
Treasury stock, issued shares
Equity Securities - Common Stock [Member]
Shareholders' Equity (Textual)
Shares Issued in connection with DRIP			1,126,675
Amounts Received in connection with DRIP			$ 11,379,153
Reinvestments in common stock			3,218,336
Cash dividends paid			12,412,874
Dividend per common share			$ 0.30
Dividend declared per share on April 9, 2013 by company	$ 0.15		$ 0.15
Declaration Date			Apr. 09, 2013
Dividends payable, Date to be paid			Jun. 17, 2013
Record Date			May 15, 2013
Series A Cumulative Redeemable Preferred Stock [Member]
Shareholders' Equity (Textual)
Preferred stock, shares authorized	2,139,750		2,139,750		2,139,750
Dividend rate on preferred stock			7.625%
Cash dividends paid			2,039,452
Dividend per Share			$ 0.9531
Dividend declared per share on April 9, 2013 by company	$ 0.4766		$ 0.4766
Declaration Date			Apr. 09, 2013
Dividends payable, Date to be paid			Jun. 17, 2013
Record Date			May 15, 2013
Annual rate of dividends cumulative and payable			$ 1.90625
Series B Cumulative Redeemable Preferred Stock [Member]
Shareholders' Equity (Textual)
Preferred stock, shares authorized	2,300,000		2,300,000		2,300,000
Dividend rate on preferred stock			7.875%
Cash dividends paid			$ 2,264,064
Dividend per Share			$ 0.9844
Dividend declared per share on April 9, 2013 by company	$ 0.4922		$ 0.4922
Declaration Date			Apr. 19, 2013
Dividends payable, Date to be paid			Jun. 17, 2013
Record Date			May 15, 2013
Annual rate of dividends cumulative and payable			$ 1.96875