RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Net interest income	$ 4,206,547	$ 3,117,572
General and administrative fees	(1,466,685)	(1,390,061)
Unrealized gain (loss) on residential loans held in securitization trusts	0	(255,403)	$ (255,403)
Net income (loss)	$ 1,474,767	$ 11,315,000	11,315,000	$ 11,315,000
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income			1,147,641
Interest expense			920,057
Net interest income			227,584
General and administrative fees			(6,928)
Unrealized gain (loss) on residential loans held in securitization trusts			(255,403)
Net income (loss)			$ (34,747)