SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)			3 Months Ended	6 Months Ended		12 Months Ended
	Apr. 12, 2019	Feb. 14, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 15, 2019	Dec. 15, 2015
Debt and Equity Securities, FV-NI [Line Items]
Maximum exposure to loss from consolidated trusts				$ 0		$ 4,762,149
Non-accrual status			$ 0	0
Recognized impairment			0	0
Allowance for loan losses			0	0
Principal amount			40,250,000	40,250,000
Deferred financing costs amortized			1,090,372	1,090,372
Available for sale securities			$ 0	$ 0		0
Outstanding repurchase agreements						$ 0
Common stock, shares authorized (in shares)			450,000,000	450,000,000		450,000,000
Common stock, par value (in dollars per share)			$ 0.01	$ 0.01		$ 0.01
Common stock, shares issued (in shares)			23,687,664	23,687,664		23,687,664
Stock repurchase program, authorized amount								$ 10,000,000
Preferred stock, shares outstanding (in shares)			0	0		1,610,000
Preferred stock, dividend rate, percentage				8.75%	8.75%	8.75%
Preferred stock, liquidation preference (in dollars per share)						$ 25
Preferred stock, shares authorized (in shares)			50,000,000	50,000,000		50,000,000
Preferred stock, par value (in dollars per share)			$ 0.01	$ 0.01		$ 0.01
Preferred stock, shares issued (in shares)			0	0		1,610,000
Common stock, shares outstanding (in shares)			23,687,664	23,687,664		23,687,664
Tax liability						$ 1,960,000
Internal Revenue Service (IRS)
Debt and Equity Securities, FV-NI [Line Items]
Income taxes, interest paid	$ 1,960,000
Redeemable Preferred Stock
Debt and Equity Securities, FV-NI [Line Items]
Preferred stock, shares outstanding (in shares)		1,610,000
Preferred stock, dividend rate, percentage		8.75%
Preferred stock, liquidation preference (in dollars per share)		$ 25
Stock Repurchase Program
Debt and Equity Securities, FV-NI [Line Items]
Common stock repurchase activity (in shares)			0	0
Credit Agreement | Delayed Draw Facility
Debt and Equity Securities, FV-NI [Line Items]
Principal amount		$ 40,250,000.00	$ 40,250,000.00	$ 40,250,000.00			$ 40,250,000.00
Collateralized Loan Obligations
Debt and Equity Securities, FV-NI [Line Items]
Maximum exposure to loss from consolidated trusts						$ 124,046,671