RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Interest expense	$ 5,571,000	$ 4,604,000	$ 12,981,000	$ 18,398,000	$ 17,938,000	$ 17,881,000	$ 16,767,000	$ 16,408,000
Net interest income	4,598,000	5,115,000	4,570,000	3,118,000	4,782,000	4,746,000	4,828,000	5,784,000	$ 17,400,715	$ 20,139,551
General and administrative fees									(4,006,774)	(5,454,786)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts									5,650,199	(961,100)
Net income (loss)	$ 350,000	$ 4,353,000	$ (21,490,000)	$ 11,315,000	$ 8,891,000	$ (4,256,000)	$ (2,297,000)	$ 2,369,000	(5,471,462)	4,706,961
Residential mortgage loans
Variable Interest Entity [Line Items]
Interest income									2,102,352	5,103,853
Interest expense									1,685,971	4,059,894
Net interest income									416,381	1,043,959
General and administrative fees									(20,886)	(44,976)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts									5,650,199	(961,100)
Net income (loss)									$ 6,045,694	$ 37,883