Shareholders' Equity (Details Narrative) - USD ($)			3 Months Ended
	Oct. 02, 2017	Jun. 29, 2017	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares authorized			192,039,750		192,039,750
Common stock, shares issued			77,209,110		75,630,521
Common stock, shares outstanding			77,209,110		75,630,521
Excess stock, shares authorized			200,000,000		200,000,000
Excess Stock, par value			$ 0.01		$ 0.01
Excess Stock , shares issued
Excess Stock , shares outstanding
Amount of dividend reinvested			$ 2,919,972	$ 2,077,156
Dividend Reinvestment and Stock Purchase Plan [Member]
Subsidiary or Equity Method Investee [Line Items]
Common stock issued under plan			1,546,089
Preferred Stock ATM Program [Member]
Subsidiary or Equity Method Investee [Line Items]
Cumulative redeemable preferred, stock dividend rate		6.125%
Maximum proceeds from issuance of sale of equity		$ 100,000,000
Number of preferred stock shares sold			1,039,934
Weighted average exercise price per share			$ 25.13
Net proceeds from offering			$ 25,688,000
Preferred Stock ATM Program [Member] | January 24, 2018 [Member]
Subsidiary or Equity Method Investee [Line Items]
Number of preferred stock shares sold			145,997
Weighted average exercise price per share			$ 25.04
Net proceeds from offering			$ 3,595,000
Maximum [Member] | January 16, 2018 [Member]
Subsidiary or Equity Method Investee [Line Items]
Share Repurchase Program authorizes amount			$ 10,000,000
Common Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage increase in common stock dividend	6.25%
Dividend declared per share			$ 0.17
Common stock dividend, description	Board of Directors approved a 6.25% increase in the Company’s quarterly common stock dividend, raising it to $0.17 per share from $0.16 per share, representing the Company’s second dividend increase in three years.
Increase in dividend period	3 years
Annualized dividend rate per share price	$ 0.68
Period of maintained or increased its cash dividend	26 years
Cash raised from issuance of common stock under DRIP			$ 25,531,430
Amount of dividend reinvested			2,919,972
Cash dividends paid			$ 13,016,721
Dividend declaration date			Jan. 16, 2018
Dividends payable, date to be paid			Mar. 15, 2018
Dividend payable date of record			Feb. 15, 2018
Common Stock [Member] | Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share	$ 0.16
Common Stock [Member] | Maximum [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividend declared per share	$ 0.17
Series C Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized			12,400,000		12,400,000
Cumulative redeemable preferred, stock dividend rate			6.125%		6.125%
Preferred stock, par value			$ 0.01		$ 0.01
Preferred stock, shares issued			10,879,379		9,839,445
Preferred stock, shares outstanding			10,879,379		9,839,445
Series C Cumulative Redeemable Preferred Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Cumulative redeemable preferred, stock dividend rate			6.125%
Preferred stock, shares issued			10,879,379
Preferred stock, shares outstanding			10,879,379
Dividend declared per share			$ 0.3828125
Cash dividends paid			$ 4,080,685
Dividend declaration date			Jan. 16, 2018
Dividends payable, date to be paid			Mar. 15, 2018
Dividend payable date of record			Feb. 15, 2018
Accrued dividend			$ 1,388,254
Annual rate of dividends cumulative and payable			$ 1.53125
Preferred stock redemption price			$ 25.00