Shareholders' Equity (Details Narrative) - USD ($)		6 Months Ended
	Jan. 19, 2016	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares authorized		200,000,000		200,000,000
Excess stock, shares authorized		200,000,000		200,000,000
Percentage increase in common stock dividend		6.70%
Common stock dividend, description		Board of Directors approved a 6.7% increase in the Company’s quarterly common stock dividend, raising it to $0.16 per share from $0.15 per share.
Annualized dividend rate per share price		$ .64
Cash raised from issuance of common stock under DRIP		$ 32,375,086
Amount of dividend reinvested		4,174,782	$ 4,131,530
Cash dividends paid		$ 20,467,456
Dividend per common stock		$ 0.16
Dividend Reinvestment and Stock Purchase Plan [Member]
Subsidiary or Equity Method Investee [Line Items]
Common stock issued under plan		3,284,570
Common Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share	$ 0.16
Declaration date	Jan. 19, 2016
Dividends payable, date to be paid	Mar. 15, 2016
Record date	Feb. 16, 2016
Common Stock [Member] | April 5, 2016 [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share		$ 0.16
Declaration date		Apr. 05, 2016
Dividends payable, date to be paid		Jun. 15, 2016
Record date		May 16, 2016
Series A Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized		2,139,750		2,139,750
Cumulative redeemable preferred, stock dividend rate		7.625%		7.625%
Series B Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized		2,300,000		2,300,000
Cumulative redeemable preferred, stock dividend rate		7.875%		7.875%
Series A Cumulative Redeemable Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share		$ 0.4765625
Declaration date		Apr. 05, 2016
Dividends payable, date to be paid		Jun. 15, 2016
Record date		May 16, 2016
Cash dividends paid		$ 2,039,452
Dividend per preferred stock		$ 0.953125
Dividend on preferred stock percentage		7.625%
Annual rate of dividends cumulative and payable		$ 1.90625
Series B Cumulative Redeemable Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share		$ 0.4921875
Declaration date		Apr. 05, 2016
Dividends payable, date to be paid		Jun. 15, 2016
Record date		May 16, 2016
Cash dividends paid		$ 2,264,064
Dividend per preferred stock		$ 0.984375
Dividend on preferred stock percentage		7.875%
Annual rate of dividends cumulative and payable		$ 1.96875