USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Condensed Consolidated Statement of Operations (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Variable Interest Entity [Line Items]
Net interest income	$ 4,732,979			$ 4,831,984			$ 14,504,736	$ 13,791,320
General and administrative fees	(935,817)			(786,651)			(2,136,144)	(2,531,385)
Net income	2,374,468	$ 1,680,242	$ 2,808,643	2,551,010	$ 1,878,703	$ 1,551,671	6,863,353	5,981,384
LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Interest income	9,412,072						24,543,893
Interest expense	(3,891,093)						(8,288,278)
Net interest income	5,520,979						16,255,615
General and administrative fees	(118,804)						(147,604)
Net income	$ 5,402,175						$ 16,108,011
Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd.
Variable Interest Entity [Line Items]
Interest income				7,900,183				25,225,152
Interest expense				(2,495,996)				(9,649,523)
Net interest income				5,404,187				15,575,629
General and administrative fees				(201,459)				(497,088)
Net income				$ 5,202,728				$ 15,078,541