COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Loan Portfolio Activity (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2019		$ 635,260,420
Purchases and fundings		38,613,756	$ 64,612,349
Proceeds from principal payments		(34,507,879)	$ (34,014,437)
Balance at March 31, 2020	[1]	639,366,297
Commercial real estate portfolio segment
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2019		635,260,420
Purchases and fundings		38,613,756
Proceeds from principal payments		(34,507,879)
Balance at March 31, 2020		$ 639,366,297

[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, 2020 and December 31, 2019, assets of consolidated VIEs related to Hunt CRE 2017-F1, Ltd. and Hunt CRE 2018-FL2, Ltd. totaled 636,607,029 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 506,907,671 and $506,662,238 respectively. See Note 5 for further discussion.