COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Loan Portfolio Activity (Details) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2020		$ 547,345,334
Purchases and fundings		34,888,000	$ 38,613,756
Proceeds from principal payments		(98,068,085)	$ (34,507,879)
Balance at March 31, 2021	[1]	484,165,249
Commercial real estate portfolio segment
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2020		547,345,334
Purchases and fundings		34,888,000
Proceeds from principal payments		(98,068,085)
Balance at March 31, 2021		$ 484,165,249

[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 March 31, 2021 and December 31, 2020, assets of consolidated VIEs related to Hunt CRE 2017-F1, Ltd. and Hunt CRE 2018-FL2, Ltd. totaled $537,399,673 and $591,318,506, respectively and the liabilities of consolidated VIEs related to Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd totaled $409,716,943 and $463,411,967 respectively. See Note 4 for further discussion.