SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		3 Months Ended	12 Months Ended
	May 05, 2021 shares	Jun. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) sub-servicer $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Feb. 14, 2019 USD ($)	Jan. 15, 2019 USD ($)	Dec. 15, 2015 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Nonaccrual status loans | $			$ 0
Recognized impairment | $			0
Allowance for loan losses | $			$ 0
Number of sub-servers | sub-servicer			2
Principal amount | $			$ 47,750,000	$ 40,250,000
Deferred financing costs amortized | $			$ 1,405,133
Common stock, shares authorized (in shares) | shares			450,000,000	450,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Common stock, shares issued (in shares) | shares			24,947,883	24,943,383
Common stock, shares outstanding (in shares) | shares			24,947,883	24,943,383
Stock repurchase program, authorized amount | $							$ 10,000,000
Preferred stock, shares authorized (in shares) | shares			50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Preferred stock, shares issued (in shares) | shares			2,400,000	0
Preferred stock, dividend rate (percentage)			7.875%	7.875%
Preferred stock, shares outstanding (in shares) | shares			2,400,000	0
Other Operating Expenses
Debt and Equity Securities, FV-NI [Line Items]
Reclassification of deferred financing costs of other assets to other operating expenses | $		$ 624,816
Delayed Draw Facility | Credit Agreement
Debt and Equity Securities, FV-NI [Line Items]
Principal amount | $			$ 47,750,000		$ 40,250,000	$ 40,250,000
Redeemable Preferred Stock
Debt and Equity Securities, FV-NI [Line Items]
Preferred stock, shares authorized (in shares) | shares			50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01
Preferred stock, shares issued (in shares) | shares	2,400,000		2,400,000	0
Preferred stock, dividend rate (percentage)	7.875%
Preferred stock, shares outstanding (in shares) | shares			2,400,000	0
Collateralized Loan Obligations
Debt and Equity Securities, FV-NI [Line Items]
Maximum exposure to loss from consolidated trusts | $			$ 166,250,000	$ 124,046,671