Shareholders' Equity (Details Narrative) - USD ($)				9 Months Ended
	Sep. 15, 2016	Aug. 15, 2016	Apr. 05, 2016	Sep. 30, 2016	Aug. 11, 2016	Dec. 31, 2015
Proceed from dividend reinvestment and stock purchase plan (DRIP)				$ 1,738,947
New shares issued under DRIP, value				$ 11,006,722
New shares issued under DRIP				1,026,701
Common stock shares authorized			62,000,000	75,000,000	71,000,000	62,000,000
Shares authorized			81,663,800		85,663,800
Excess stock, shares authorized			3,000,000	3,000,000	3,000,000	3,000,000
Maximum [Member]
Common stock shares authorized			11,000,000		4,000,000
Shares authorized			70,663,800		81,663,800
Common Stock [Member]
Dividends paid	$ 5,031,778			$ 14,814,113
Dividend declared per share, paid	$ 0.18
Proceed from dividend reinvestment and stock purchase plan (DRIP)		$ 629,869		1,738,947
Dividend declare date	Oct. 03, 2016
Paid on dividend date	Dec. 15, 2016
Record date of dividend	Nov. 15, 2016
8.25% Series A Cumulative Redeemable Preferred Stock [Member]
Dividends paid	$ 1,889,147			$ 5,667,441
Dividend declared per share, paid	$ 0.515625			$ 0.515625
Dividend declare date				Oct. 03, 2016
Annual rate on dividend per share payable quarterly	$ 2.0625
Paid on dividend date				Dec. 15, 2016
Record date of dividend	Aug. 15, 2016			Nov. 15, 2016
Cumulative redeemable preferred stock, par value	$ 25.00
8.0% Series B Cumulative Redeemable Preferred Stock [Member]
Dividends paid	$ 1,900,600			$ 5,106,458
Dividend declared per share, paid	$ 0.50
Dividend declare date				Oct. 03, 2016
Annual rate on dividend per share payable quarterly	$ 2.00			$ 2.00
Paid on dividend date				Dec. 15, 2016
Record date of dividend	May 16, 2016			Nov. 15, 2016
Cumulative redeemable preferred stock, par value		$ 25.00
Cumulative redeemable preferred stock percentage		8.00%
Number of shares issued and sold during period			2,000,000
Sale price per share			$ 25.50
Proceeds from sale of common stock			$ 49,100,000
Series A Cumulative Redeemable Preferred Stock [Member]
Cumulative redeemable preferred stock, par value			$ 0.10	$ 0.10		$ 0.10
Common stock shares authorized			73,000,000		75,000,000
Cumulative redeemable preferred stock, shares authorized			3,663,800	3,663,800	3,663,800	3,663,800
Percentage rate on cumulative redeemable preferred stock				8.25%		8.25%
Series A Cumulative Redeemable Preferred Stock [Member] | Amendment [Member]
Common stock shares authorized			71,000,000
Cumulative redeemable preferred stock, shares authorized			3,663,800		3,663,800
Series B Cumulative Redeemable Preferred Stock [Member]
Cumulative redeemable preferred stock, par value			$ 0.10	$ 0.10		$ 0.10
Cumulative redeemable preferred stock, shares authorized			2,000,000	4,000,000	4,000,000	2,000,000
Reclassifying common stock shares as preferred stock			2,000,000
Percentage rate on cumulative redeemable preferred stock				8.00%		8.00%
Series B Cumulative Redeemable Preferred Stock [Member] | Amendment [Member]
Cumulative redeemable preferred stock, shares authorized			4,000,000		4,000,000
Excess stock, shares authorized			3,000,000		3,000,000