ORGANIZATION AND BUSINESS OPERATIONS - Narrative (Details) - USD ($)			9 Months Ended
	Mar. 18, 2019	Feb. 14, 2019	Sep. 30, 2020	Dec. 31, 2019	Jan. 15, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Principal amount			$ 40,250,000	$ 40,250,000
Preferred stock, shares outstanding (in shares)						1,610,000
Preferred stock, dividend rate, percentage			8.75%
Preferred stock, liquidation preference (in dollars per share)						$ 25.00
Hunt Investment Management, LLC | Support Agreement
Variable Interest Entity [Line Items]
Maximum reduction of expense reimbursement per annum (percent)	25.00%
Maximum expense reimbursement reduction per annum	$ 568,000
Aggregate reduction of expense reimbursement	$ 1,960,000
Redeemable Preferred Stock
Variable Interest Entity [Line Items]
Working capital		$ 1,100,000
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
Credit Agreement | Delayed Draw Facility
Variable Interest Entity [Line Items]
Principal amount		$ 40,250,000	$ 40,250,000		$ 40,250,000
Proceeds from debt		$ 39,200,000