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AGREEMENTS AND RELATED PARTY TRANSACTIONS (Details)					3 Months Ended		12 Months Ended
	Feb. 25, 2022 USD ($)	Jan. 01, 2021 qtr	Dec. 23, 2020 USD ($)	Aug. 02, 2018	Mar. 31, 2025 USD ($) component	Mar. 31, 2024 USD ($)	Dec. 31, 2018	Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items]
Look-back period provision | qtr		12
Base management fee					$ 8,019,000	$ 8,279,000
Base management fees payable					8,019,000			$ 7,888,000
Incentive management fees					7,738,000	8,167,000
Incentive management fees payable					7,738,000			7,871,000
Administrative fees expenses					300,000	600,000
Administrative fees payable					$ 349,000			$ 540,000
Original Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent				1.375%
Incentive fee, percent	2.00%
Amended and Restated Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent		1.25%
New Barings BDC Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent	2.0625%
Original Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent	8.00%
New Barings BDC Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent	8.25%
Investment Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent					1.25%
Investment Management Agreement | Related Party
Related Party Transaction [Line Items]
Number of components | component					2
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		2.0625%
Investment Management Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		8.25%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		100.00%
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		2.57812%
Investment Management Agreement - Incentive Rate, Annual Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		10.3125%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		20.00%
Pre-Incentive Fee Net Investment Income For Trailing Twelve Quarters Exceeds Catch-Up Amount | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		20.00%
Investment Management Agreement - Incentive Rate, Cumulative Pre-Incentive Fee Net Return | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		20.00%
Investment Management Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent							20.00%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income
Related Party Transaction [Line Items]
Incentive management fees					$ 7,700,000	8,200,000
Investment Management Agreement - Incentive Rate, Capital Gain Fee
Related Party Transaction [Line Items]
Incentive management fees					$ 0	$ 0
MVC Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)			$ 23,000,000
Related party transaction, term			10 years
MVC Credit Support Agreement - Covered Credit Losses Minimum | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)			$ 0.00
Sierra Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)	$ 100,000,000
Related party transaction, term	10 years
Sierra Credit Support Agreement Covered Credit Losses Minimum | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)	$ 0.00

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