EQUITY - Narrative (Details)					3 Months Ended					9 Months Ended		12 Months Ended
		May 05, 2021 USD ($) $ / shares shares	Jan. 03, 2020 USD ($) $ / shares shares	Nov. 29, 2018 USD ($) shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 shares	Mar. 31, 2020 shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Jul. 01, 2021 USD ($) $ / shares	May 03, 2021 shares	Dec. 15, 2015 USD ($)
Stockholders' Equity Note [Line Items]
Common stock, shares authorized (in shares) | shares					450,000,000					450,000,000		450,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01					$ 0.01		$ 0.01
Common stock, shares outstanding (in shares) | shares					24,947,883					24,947,883		24,943,383
Common stock, shares issued (in shares) | shares					24,947,883					24,947,883		24,943,383
Stock repurchase program, authorized amount															$ 10,000,000
Preferred stock, shares authorized (in shares) | shares					50,000,000					50,000,000		50,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01					$ 0.01		$ 0.01
Preferred stock, shares outstanding (in shares) | shares					2,400,000					2,400,000		0
Preferred stock, shares issued (in shares) | shares					2,400,000					2,400,000		0
Dividends payable	[1]				$ 3,246,601					$ 3,246,601		$ 3,242,640
Noncontrolling interests	[1]				99,500					99,500		$ 99,500
Dividends on the HCMT Preferred Shares					$ 1,198,167		$ 3,792			1,927,542	$ 11,292
Preferred dividends paid										$ 11,292
Redeemable Preferred Stock
Stockholders' Equity Note [Line Items]
Preferred stock, shares authorized (in shares) | shares					50,000,000					50,000,000		50,000,000		2,400,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01					$ 0.01		$ 0.01
Preferred stock, shares outstanding (in shares) | shares					2,400,000					2,400,000		0
Preferred stock, shares issued (in shares) | shares		2,400,000			2,400,000					2,400,000		0
Proceeds from issuance of redeemable preferred stock		$ 58,100,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares		$ 25.00
Stock Repurchase Program
Stockholders' Equity Note [Line Items]
Number of shares repurchased (in shares) | shares					126,856					126,856
Weighted average share price of common stock repurchased (in dollars per share) | $ / shares										$ 5.09
Common stock repurchase activity (in shares) | shares					0
Stock repurchase program, remaining authorized amount					$ 9,400,000					$ 9,400,000
Common Stock
Stockholders' Equity Note [Line Items]
Issuance of common stock (in shares) | shares			1,246,719			4,500		4,500	1,246,719
Dividends payable					$ 6,735,522					$ 6,735,522			$ 918,750
Dividends payable, amount per share (in dollars per share) | $ / shares					$ 0.27					$ 0.27			$ 0.383
Noncontrolling interests
Stockholders' Equity Note [Line Items]
Dividends payable					$ 3,792					$ 3,792
Noncontrolling interests | Preferred Stock
Stockholders' Equity Note [Line Items]
Number of shares issued (in shares) | shares				125
Noncontrolling interests				$ 99,500
Equity raised				125,000
Non-controlling interests expenses				$ 25,500
Dividend rate percentage (as a percent)				12.00%
Redemption price ratio												1.1
Dividends on the HCMT Preferred Shares												$ 15,000
Hunt | Private Placement
Stockholders' Equity Note [Line Items]
Common stock, shares issued (in dollars per share) | $ / shares			$ 4.61
Aggregate capital raise			$ 5,700,000

[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.