CONSOLIDATED SCHEDULE OF INVESTMENTS - Fair Value along with Transactions in Affiliated Investments - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Net change in unrealized gains (losses)	$ 18,036	$ 53,771	$ 23,341
Net realized gains (losses)	(69,239)	(67,367)	(21,506)
Affiliated Investments | Investment, Identifier [Axis]: 1244311 B.C. Ltd. | Term Loan
Fair Value, Beginning Balance	3,800	3,822
Gross Additions	54	63
Gross Reductions		(15)
Net change in unrealized gains (losses)	(24)	(70)
Fair Value , Ending Balance	3,830	3,800	3,822
Interest/ Dividend/ Other Income	229	245
Affiliated Investments | Investment, Identifier [Axis]: 1244311 B.C. Ltd. | Common Stock
Fair Value, Beginning Balance	976	1,719
Net change in unrealized gains (losses)	(637)	(743)
Fair Value , Ending Balance	339	976	1,719
Affiliated Investments | Investment, Identifier [Axis]: 9357-5991 Quebec Inc. | Term Loan
Gross Reductions		(215)
Net realized gains (losses)		215
Affiliated Investments | Investment, Identifier [Axis]: AIC SPV Holdings II, LLC | Preferred Equity
Fair Value, Beginning Balance	355	498
Net change in unrealized gains (losses)	(281)	(143)
Fair Value , Ending Balance	74	355	498
Interest/ Dividend/ Other Income	73	109
Affiliated Investments | Investment, Identifier [Axis]: Affiliated Investments
Fair Value, Beginning Balance	63,709	50,874
Gross Additions	40,685	1,374
Gross Reductions	(48,021)	(4,478)
Net change in unrealized gains (losses)	(5,008)	15,398
Fair Value , Ending Balance	49,141	63,709	50,874
Net realized gains (losses)	(2,224)	541
Interest/ Dividend/ Other Income	1,139	1,551
Affiliated Investments | Investment, Identifier [Axis]: Carbonfree Chemicals Holdings LLC | Common Stock
Fair Value, Beginning Balance	42,117	25,424
Gross Additions	25,074	904
Gross Reductions	(20,000)
Net change in unrealized gains (losses)	(24,765)	15,789
Fair Value , Ending Balance	20,202	42,117	25,424
Net realized gains (losses)	(2,224)
Affiliated Investments | Investment, Identifier [Axis]: Carbonfree Chemicals SA LLC | Class B Units
Gross Reductions	(25,074)
Net change in unrealized gains (losses)	25,074
Affiliated Investments | Investment, Identifier [Axis]: FC2 LLC | Term Loan
Gross Additions	12,500
Fair Value , Ending Balance	12,500
Interest/ Dividend/ Other Income	176
Affiliated Investments | Investment, Identifier [Axis]: GSC Technologies Inc. | Term Loan
Fair Value, Beginning Balance	192
Gross Additions	7	221
Gross Reductions	(23)	(15)
Net change in unrealized gains (losses)		(14)
Fair Value , Ending Balance	177	192
Interest/ Dividend/ Other Income	16	16
Affiliated Investments | Investment, Identifier [Axis]: Golden Bear 2016-R, LLC | Membership Interests
Fair Value, Beginning Balance	10,038	11,289
Gross Additions		186
Net change in unrealized gains (losses)	(625)	(1,437)
Fair Value , Ending Balance	9,413	10,038	11,289
Interest/ Dividend/ Other Income	645	1,181
Affiliated Investments | Investment, Identifier [Axis]: KLO Acquisition LLC | Term Loan
Gross Reductions		(327)
Net change in unrealized gains (losses)		1
Net realized gains (losses)		326
Affiliated Investments | Investment, Identifier [Axis]: Pelican Energy, LLC | Common Stock
Fair Value, Beginning Balance	630	2,170
Gross Reductions	(792)	(3,701)
Net change in unrealized gains (losses)	357	2,161
Fair Value , Ending Balance	195	630	2,170
Affiliated Investments | Investment, Identifier [Axis]: Renew Financial LLC (f/k/a Renewable Funding, LLC) | Series B Preferred Stock
Fair Value, Beginning Balance		42
Net change in unrealized gains (losses)		(42)
Fair Value , Ending Balance			42
Affiliated Investments | Investment, Identifier [Axis]: Renew Financial LLC (f/k/a Renewable Funding, LLC) | Series D Preferred Stock
Fair Value, Beginning Balance		28
Net change in unrealized gains (losses)		(28)
Fair Value , Ending Balance			28
Affiliated Investments | Investment, Identifier [Axis]: Renew Financial LLC (f/k/a Renewable Funding, LLC) | Series E Preferred Stock
Fair Value, Beginning Balance	4,988	5,106
Gross Reductions	(2,050)
Net change in unrealized gains (losses)	(2,938)	(118)
Fair Value , Ending Balance		4,988	5,106
Affiliated Investments | Investment, Identifier [Axis]: Renew Financial LLC (f/k/a Renewable Funding, LLC) | Common Stock
Gross Additions	2,050
Net change in unrealized gains (losses)	(2,050)
Affiliated Investments | Investment, Identifier [Axis]: Renew Financial LLC (f/k/a Renewable Funding, LLC) | Preferred Equity
Gross Additions	1,000
Net change in unrealized gains (losses)	961
Fair Value , Ending Balance	1,961
Affiliated Investments | Investment, Identifier [Axis]: Renew JV LLC | Membership Interests
Fair Value, Beginning Balance	613	776
Gross Reductions	(82)	(205)
Net change in unrealized gains (losses)	(81)	42
Fair Value , Ending Balance	$ 449	$ 613	$ 776