RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Net interest income	$ 5,114,636	$ 4,745,766	$ 12,802,118	$ 15,357,448
General and administrative fees	(796,600)	(1,288,978)	(3,148,945)	(4,120,807)
Unrealized gain (loss) on residential loans held in securitization trusts	0	(155,252)	5,650,199	(773,674)
Net income (loss)	4,353,026	(4,256,337)	(5,822,037)	(4,183,767)
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income	0	1,249,966	2,102,352	3,903,924
Interest expense	0	995,293	1,685,971	3,100,616
Net interest income	0	254,673	416,381	803,308
General and administrative fees	0	(11,003)	(20,886)	(34,227)
Unrealized gain (loss) on residential loans held in securitization trusts	0	(155,252)	5,650,199	(773,674)
Net income (loss)	$ 0	$ 88,418	$ 6,045,694	$ (4,593)