RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Variable Interest Entity [Line Items]
Net interest income	$ 4,046,715		$ 4,569,910		$ 8,253,262	$ 7,687,482
General and administrative fees	(895,659)		(962,284)		(2,362,344)	(2,352,345)
Unrealized gain (loss) on residential loans held in securitization trusts	0		5,905,602		0	5,650,199
Net income (loss)	$ 1,394,170	$ 1,474,767	(21,490,063)	$ 11,315,000	$ 2,868,937	(10,175,063)
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income			954,711			2,102,352
Interest expense			765,914			1,685,971
Net interest income			188,797			416,381
General and administrative fees			(13,958)			(20,886)
Unrealized gain (loss) on residential loans held in securitization trusts			5,905,602			5,650,199
Net income (loss)			$ 6,080,441			$ 6,045,694