RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statements of Operations
Interest expense	$ 17,938,000	$ 17,881,000	$ 16,767,000	$ 16,408,000	$ 16,259,000	$ 16,580,000	$ 17,837,000	$ 18,857,000
Net interest income	4,782,000	4,746,000	4,828,000	5,784,000	5,903,000	6,153,000	5,772,000	5,760,000	$ 20,139,551	$ 23,588,344	$ 31,309,716
General and administrative fees									(5,454,786)	(5,867,851)	(6,660,934)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts									(961,100)	404,720	(8,153,474)
Net income (loss)	$ 8,891,000	$ (4,256,000)	$ (2,297,000)	$ 2,369,000	$ 11,538,000	$ 1,496,000	$ (4,076,000)	$ (16,948,000)	4,706,961	(7,989,955)	450,479
Residential mortgage loans
Statements of Operations
Interest income									5,103,853	10,585,191	19,986,204
Interest expense									4,059,894	8,117,402	13,156,912
Net interest income									1,043,959	2,467,789	6,829,292
General and administrative fees									(44,976)	(266,957)	(635,547)
Unrealized gain (loss) on residential mortgage loans held in securitization trusts									(961,100)	404,720	(8,153,474)
Net income (loss)									$ 37,883	$ 2,605,552	$ (1,959,729)