Consolidated Statements of Shareholders' Equity - USD ($)		Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Undistributed Income (Accumulated Deficit) [Member]	Series A Cumulative Redeemable Preferred Stock [Member]	Series B Cumulative Redeemable Preferred Stock [Member]	Series C Cumulative Redeemable Preferred Stock [Member]	Series D Cumulative Redeemable Preferred Stock [Member]	Total
Balance at Dec. 31, 2015		$ 2,708,684	$ 109,629,260	$ (2,056,726)	$ (667,793)	$ 91,595,000	$ 45,030,000	$ 0	$ 0	$ 246,238,425
Balance, shares at Dec. 31, 2015		27,086,838
Common Stock Issued with the DRIP	[1]	$ 196,613	22,204,332	0	0	0	0	0	0	22,400,945
Common Stock Issued with the DRIP, shares	[1]	1,966,133
Common Stock Issued through Restricted Stock Awards		$ 6,050	(6,050)	0	0	0	0	0	0	0
Common Stock Issued through Restricted Stock Awards, shares		60,500
Common Stock Issued through Stock Options		$ 27,750	2,457,310	0	0	0	0	0	0	2,485,060
Common Stock Issued through Stock Options, shares		277,500
Cancellation of Shares Due to Restricted Stock Forfeitures		$ (216)	216	0	0	0	0	0	0	0
Cancellation of Shares Due to Restricted Stock Forfeitures, shares		(2,160)
Preferred Stock Issued through Registered Direct Placement, net		$ 0	(879,147)	0	0	0	50,000,000	0	0	49,120,853
Distributions		0	(23,047,908)	0	(11,534,559)	0	0	0	0	(34,582,467)
Stock Compensation Expense		0	1,064,678	0	0	0	0	0	0	1,064,678
Net Income (Loss)		0	0	0	11,534,559	0	0	0	0	11,534,559
Unrealized Net Holding Gain on Securities Available for Sale, Net of Reclassification Adjustment		0	0	18,772,197	0	0	0	0	0	18,772,197
Interest Rate Swaps		0	0	(2,283)	0	0	0	0	0	(2,283)
Balance at Dec. 31, 2016		$ 2,938,881	111,422,691	16,713,188	(667,793)	91,595,000	95,030,000	0	0	317,031,967
Balance, shares at Dec. 31, 2016		29,388,811
Common Stock Issued with the DRIP	[1]	$ 409,536	59,955,654	0	0	0	0	0	0	60,365,190
Common Stock Issued with the DRIP, shares	[1]	4,095,357
Common Stock Issued through Restricted Stock Awards		$ 5,600	(5,600)	0	0	0	0	0	0	0
Common Stock Issued through Restricted Stock Awards, shares		56,000
Common Stock Issued through Stock Options		$ 54,790	5,380,844	0	0	0	0	0	0	5,435,634
Common Stock Issued through Stock Options, shares		547,900
Common Stock Issued through Registered Direct Placement, net		$ 140,000	22,378,238	0	0	0	0	0	0	22,518,238
Common Stock Issued through Registered Direct Placement, net, shares		1,400,000
Preferred Stock Issued through Underwritten Registered Public Offering, net		$ 0	(4,774,153)	0	0	0	0	143,750,000	0	138,975,847
Preferred Stock Called for Redemption		0	3,488,159	0	(3,488,159)	(91,595,000)	0	0	0	(91,595,000)
Distributions		0	(31,125,456)	0	(9,179,875)	0	0	0	0	(40,305,331)
Stock Compensation Expense		0	1,314,491	0	0	0	0	0	0	1,314,491
Net Income (Loss)		0	0	0	12,668,034	0	0	0	0	12,668,034
Unrealized Net Holding Gain on Securities Available for Sale, Net of Reclassification Adjustment		0	0	(5,197,589)	0	0	0	0	0	(5,197,589)
Interest Rate Swaps		0	0	3,983	0	0	0	0	0	3,983
Balance at Dec. 31, 2017		$ 3,548,807	168,034,868	11,519,582	(667,793)	0	95,030,000	143,750,000	0	421,215,464
Balance, shares at Dec. 31, 2017		35,488,068
Common Stock Issued with the DRIP	[1]	$ 265,484	34,848,229	0	0	0	0	0	0	35,113,713
Common Stock Issued with the DRIP, shares	[1]	2,654,846
Common Stock Issued through Restricted Stock Awards		$ 4,900	(4,900)	0	0	0	0	0	0	0
Common Stock Issued through Restricted Stock Awards, shares		49,000
Common Stock Issued through Stock Options		$ 12,850	1,372,150	0	0	0	0	0	0	1,385,000
Common Stock Issued through Stock Options, shares		128,500
Preferred Stock Issued through Underwritten Registered Public Offering, net		$ 0	(1,752,720)	0	0	0	0	0	50,000,000	48,247,280
Distributions		0	(46,660,956)	0	0	0	0	0	0	(46,660,956)
Stock Compensation Expense		0	1,613,110	0	0	0	0	0	0	1,613,110
Net Income (Loss)		0	0	0	(36,215,571)	0	0	0	0	(36,215,571)
Unrealized Net Holding Gain on Securities Available for Sale, Net of Reclassification Adjustment		0	0	(11,519,582)	11,519,582	0	0	0	0	0
Interest Rate Swaps										0
Balance at Dec. 31, 2018		$ 3,832,041	$ 157,449,781	$ 0	$ (25,363,782)	$ 0	$ 95,030,000	$ 143,750,000	$ 50,000,000	$ 424,698,040
Balance, shares at Dec. 31, 2018		38,320,414

[1] Dividend Reinvestment and Stock Purchase Plan.