EQUITY - Narrative (Details)					3 Months Ended					9 Months Ended			12 Months Ended
		Jan. 03, 2020 USD ($) $ / shares shares	Feb. 14, 2019 $ / shares shares	Nov. 29, 2018 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares		Jun. 30, 2020 shares	Mar. 31, 2020 shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares		Sep. 30, 2019 USD ($) shares	Dec. 31, 2020	Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 $ / shares 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					24,943,383				24,943,383	24,943,383		24,943,383		23,692,164
Common stock, shares issued (in shares) | shares					24,943,383					24,943,383				23,692,164
Stock repurchase program, authorized amount																	$ 10,000,000
Preferred stock, shares authorized (in shares) | shares																50,000,000
Preferred stock, par value (in dollars per share) | $ / shares																$ 0.01
Preferred stock, shares issued (in shares) | shares																1,610,000
Preferred stock, shares outstanding (in shares) | shares																1,610,000
Preferred stock, dividend rate, percentage										8.75%
Preferred stock, liquidation preference (in dollars per share) | $ / shares																$ 25.00
Dividends payable					$ 2,123,980	[1]			$ 1,780,367	$ 2,123,980	[1]	$ 1,780,367		$ 1,776,912	[1]
Noncontrolling interests	[1]				99,500					99,500				99,500
Dividends on the HCMT Preferred Shares					$ 3,792				$ 3,792	$ 11,292		$ 488,056
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					0
Stock repurchase program, remaining authorized amount					$ 9,400,000					$ 9,400,000
Preferred Stock
Stockholders' Equity Note [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares																$ 0.01
Preferred stock, dividend rate, percentage										8.75%
Preferred stock, liquidation preference (in dollars per share) | $ / shares					$ 25					$ 25
Dividends payable					$ 3,792					$ 3,792
Redeemable Preferred Stock
Stockholders' Equity Note [Line Items]
Preferred stock, shares outstanding (in shares) | shares			1,610,000
Preferred stock, dividend rate, percentage			8.75%
Preferred stock, liquidation preference (in dollars per share) | $ / shares			$ 25
Common Stock
Stockholders' Equity Note [Line Items]
Issuance of common stock, net (in shares) | shares		1,246,719					4,500	1,246,719	4,500
Dividends payable					$ 5,861,358					$ 5,861,358
Dividends payable, amount per share (in dollars per share) | $ / shares					$ 0.24					$ 0.24
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				12.00%
Dividends on the HCMT Preferred Shares										$ 11,292				$ 15,000
Noncontrolling interests | Preferred Stock | Forecast
Stockholders' Equity Note [Line Items]
Redemption price ratio													1.1
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, 2020 and December 31, 2019, assets of consolidated VIEs related to Hunt CRE 2017-F1, Ltd. and Hunt CRE 2018-FL2, Ltd. totaled $608,690,756 and $636,541,489, respectively and the liabilities of consolidated VIEs related to Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd totaled $480,043,366 and $506,662,238 respectively. See Note 5 for further discussion.