RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Net interest income	$ 3,795,884			$ 5,114,636			$ 12,049,146	$ 12,802,118
General and administrative fees	(904,413)			(796,600)			(3,266,757)	(3,148,945)
Unrealized gain (loss) on residential loans held in securitization trusts	0			0			0	5,650,199
Net income (loss)	$ 2,157,748	$ 1,394,170	$ 1,474,767	4,353,026	$ (21,490,063)	$ 11,315,000	$ 5,026,685	(5,822,037)
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income				0				2,102,352
Interest expense				0				1,685,971
Net interest income				0				416,381
General and administrative fees				0				(20,886)
Unrealized gain (loss) on residential loans held in securitization trusts				0				5,650,199
Net income (loss)				$ 0				$ 6,045,694