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DERIVATIVE INSTRUMENTS - Fair Value and Aggregate Unrealized Depreciation (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Feb. 25, 2022	Dec. 23, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit support agreements	$ 5,586,000	$ (400,000)
MVC Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit support agreements	(328,000)		$ (1,214,000)
Sierra Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit support agreements	1,000,000		(3,700,000)
Barings LLC | MVC Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	23,000,000		23,000,000		$ 23,000,000
Fair Value	13,272,000		12,386,000
Credit support agreements	(328,000)		(1,214,000)
Barings LLC | Sierra Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	100,000,000		100,000,000	$ 100,000,000
Fair Value	45,400,000		40,700,000
Credit support agreements	$ 1,000,000		$ (3,700,000)

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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-Topic 825
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Nominal or face amount used to calculate payment on derivative.

+ References

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-SubTopic 10
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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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