THE FREMF 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 multi-family loans held in securitization trusts	694,339		$ (1,355,774)
Net income (loss)	1,474,767	$ 11,315,000	11,315,000	$ 11,315,000
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income	78,361		13,227,188
Interest expense	0		12,526,295
Net interest income	78,361		700,893
General and administrative fees	0		(623,254)
Unrealized gain (loss) on multi-family loans held in securitization trusts	694,339		(1,355,774)
Net income (loss)	$ 772,700		$ (1,278,135)