RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Interest income	$ 8,954,000	$ 9,832,000	$ 10,289,000	$ 9,983,000	$ 10,169,000	$ 9,719,000	$ 17,551,000	$ 21,516,000
Interest expense	5,589,000	6,036,000	6,242,000	5,776,000	5,571,000	4,604,000	12,981,000	18,398,000
Net interest income	3,365,000	3,796,000	4,047,000	4,207,000	4,598,000	5,115,000	4,570,000	3,118,000	$ 15,413,842	$ 17,400,715
General and administrative fees									(4,335,376)	(4,006,774)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts									0	5,650,199
Net income	$ 1,222,000	$ 2,158,000	$ 1,394,000	$ 1,475,000	$ 350,000	$ 4,353,000	$ (21,490,000)	$ 11,315,000	$ 6,248,890	(5,471,462)
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income										2,102,352
Interest expense										1,685,971
Net interest income										416,381
General and administrative fees										(20,886)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts										5,650,199
Net income										$ 6,045,694