Condensed Consolidated Statement of Changes in Equity - USD ($)	Total		Total Stockholders' Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Cumulative Distributions to Stockholders	Accumulated Earnings	Noncontrolling interests
Balance (in shares) at Dec. 31, 2019					23,692,164
Balance at Dec. 31, 2019	$ 108,644,712		$ 108,545,212		$ 236,877	$ 228,135,116	$ (122,236,981)	$ 2,410,200	$ 99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)					1,246,719
Issuance of common stock	5,747,375		5,747,375		$ 12,467	5,734,908
Cost of issuing common stock	(13,333)		(13,333)			(13,333)
Restricted stock compensation expense	7,882		7,882			7,882
Net income	1,551,671		1,551,671					1,551,671
Common stock dividends	(1,870,416)		(1,870,416)				(1,870,416)
Preferred stock dividends	(3,750)		(3,750)				(3,750)
Balance (in shares) at Mar. 31, 2020					24,938,883
Balance at Mar. 31, 2020	114,064,141		113,964,641		$ 249,344	233,864,573	(124,111,147)	3,961,871	99,500
Balance (in shares) at Dec. 31, 2019					23,692,164
Balance at Dec. 31, 2019	108,644,712		108,545,212		$ 236,877	228,135,116	(122,236,981)	2,410,200	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,981,384
Common stock dividends	(5,861,358)
Preferred stock dividends	(11,292)
Balance (in shares) at Sep. 30, 2020					24,943,383
Balance at Sep. 30, 2020	114,478,164		114,378,664		$ 249,389	233,847,322	(128,109,631)	8,391,584	99,500
Balance (in shares) at Mar. 31, 2020					24,938,883
Balance at Mar. 31, 2020	114,064,141		113,964,641		$ 249,344	233,864,573	(124,111,147)	3,961,871	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)					4,500
Issuance of common stock	14,985		14,985		$ 45	14,940
Cost of issuing common stock	(13,333)		(13,333)			(13,333)
Restricted stock compensation expense	(8,473)		(8,473)			(8,473)
Net income	1,878,703		1,878,703					1,878,703
Common stock dividends	(1,870,754)		(1,870,754)				(1,870,754)
Preferred stock dividends	(3,750)		(3,750)				(3,750)
Balance (in shares) at Jun. 30, 2020					24,943,383
Balance at Jun. 30, 2020	114,061,519		113,962,019		$ 249,389	233,857,707	(125,985,651)	5,840,574	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	0
Cost of issuing common stock	(13,334)		(13,334)			(13,334)
Restricted stock compensation expense	2,949		2,949			2,949
Net income	2,551,010		2,551,010					2,551,010
Common stock dividends	(2,120,188)		(2,120,188)				(2,120,188)
Preferred stock dividends	(3,792)		(3,792)				(3,792)
Balance (in shares) at Sep. 30, 2020					24,943,383
Balance at Sep. 30, 2020	114,478,164		114,378,664		$ 249,389	233,847,322	(128,109,631)	8,391,584	99,500
Balance (in shares) at Dec. 31, 2020				0	24,943,383
Balance at Dec. 31, 2020	113,703,152	[1]	113,603,652	$ 0	$ 249,389	233,850,271	(131,355,978)	10,859,970	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	0		0
Cost of issuing common stock	0		0			0
Issuance of preferred stock, net (in shares)				0
Issuance of preferred stock, net	0		0	$ 0
Restricted stock compensation expense	2,885		2,885			2,885
Net income	2,808,643		2,808,643					2,808,643
Common stock dividends	(2,244,904)		(2,244,904)				(2,244,904)
Preferred stock dividends	(3,708)		(3,708)				(3,708)
Balance (in shares) at Mar. 31, 2021				0	24,943,383
Balance at Mar. 31, 2021	114,266,068		114,166,568	$ 0	$ 249,389	233,853,156	(133,604,590)	13,668,613	99,500
Balance (in shares) at Dec. 31, 2020				0	24,943,383
Balance at Dec. 31, 2020	113,703,152	[1]	113,603,652	$ 0	$ 249,389	233,850,271	(131,355,978)	10,859,970	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,863,353
Common stock dividends	(6,735,523)
Preferred stock dividends	(1,927,542)
Balance (in shares) at Sep. 30, 2021				2,400,000	24,947,883
Balance at Sep. 30, 2021	169,161,542	[1]	169,062,042	$ 57,258,435	$ 249,434	233,849,892	(140,019,042)	17,723,323	99,500
Balance (in shares) at Mar. 31, 2021				0	24,943,383
Balance at Mar. 31, 2021	114,266,068		114,166,568	$ 0	$ 249,389	233,853,156	(133,604,590)	13,668,613	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)					4,500
Issuance of common stock	11,700		11,700		$ 45	11,655
Cost of issuing common stock	0		0			0
Issuance of preferred stock, net (in shares)				2,400,000
Issuance of preferred stock, net	57,258,435		57,258,435	$ 57,258,435
Restricted stock compensation expense	(8,459)		(8,459)			(8,459)
Net income	1,680,242		1,680,242					1,680,242
Common stock dividends	(2,245,309)		(2,245,309)				(2,245,309)
Preferred stock dividends	(725,667)		(725,667)				(725,667)
Balance (in shares) at Jun. 30, 2021				2,400,000	24,947,883
Balance at Jun. 30, 2021	170,237,010		170,137,510	$ 57,258,435	$ 249,434	233,856,352	(136,575,566)	15,348,855	99,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	0
Cost of issuing common stock	(11,201)		(11,201)			(11,201)
Issuance of preferred stock, net	0
Restricted stock compensation expense	4,741		4,741			4,741
Net income	2,374,468		2,374,468					2,374,468
Common stock dividends	(2,245,310)		(2,245,310)				(2,245,310)
Preferred stock dividends	(1,198,166)		(1,198,166)				(1,198,166)
Balance (in shares) at Sep. 30, 2021				2,400,000	24,947,883
Balance at Sep. 30, 2021	$ 169,161,542	[1]	$ 169,062,042	$ 57,258,435	$ 249,434	$ 233,849,892	$ (140,019,042)	$ 17,723,323	$ 99,500

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company was the primary beneficiary of these VIEs. As of September 30, 2021 and December 31, 2020, assets of consolidated VIEs totaled $1,003,113,182 and $591,318,506, respectively and the liabilities of consolidated VIEs totaled $826,707,857 and $463,411,967 respectively. See Note 4 for further discussion.