CONSOLIDATED SCHEDULE OF INVESTMENTS (unaudited) - Fair Value along with Transactions in Affiliated Investments - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Investment, Identifier [Axis]: Affiliated Investments
Fair Value, Beginning Balance	$ 49,141	$ 63,709
Gross Additions	133	40,685
Gross Reductions	(31)	(48,021)
Net change in unrealized gains (losses)	1,233	(5,008)
Fair Value , Ending Balance	50,476	49,141
Net realized gains (losses)		(2,224)
Interest/ Dividend/ Other Income	305	1,139
Investment, Identifier [Axis]: Affiliated Investments 1244311 B.C. Ltd., Common Stock
Fair Value, Beginning Balance	339	976
Net change in unrealized gains (losses)	467	(637)
Fair Value , Ending Balance	806	339
Investment, Identifier [Axis]: Affiliated Investments 1244311 B.C. Ltd., Term Loan
Fair Value, Beginning Balance	3,830	3,800
Gross Additions	25	54
Net change in unrealized gains (losses)	66	(24)
Fair Value , Ending Balance	3,921	3,830
Interest/ Dividend/ Other Income	98	229
Investment, Identifier [Axis]: Affiliated Investments AIC SPV Holdings II, LLC, Preferred Equity
Fair Value, Beginning Balance	74	355
Net change in unrealized gains (losses)	37	(281)
Fair Value , Ending Balance	111	74
Interest/ Dividend/ Other Income		73
Investment, Identifier [Axis]: Affiliated Investments Carbonfree Chemicals Holdings LLC, Common Stock
Fair Value, Beginning Balance	20,202	42,117
Gross Additions		25,074
Gross Reductions		(20,000)
Net change in unrealized gains (losses)	(724)	(24,765)
Fair Value , Ending Balance	19,478	20,202
Net realized gains (losses)		(2,224)
Investment, Identifier [Axis]: Affiliated Investments Carbonfree Chemicals SA LLC, Class B Units
Gross Reductions		(25,074)
Net change in unrealized gains (losses)		25,074
Investment, Identifier [Axis]: Affiliated Investments FC2 LLC, Term Loan
Fair Value, Beginning Balance	12,500
Gross Additions		12,500
Fair Value , Ending Balance	12,500	12,500
Interest/ Dividend/ Other Income	200	176
Investment, Identifier [Axis]: Affiliated Investments GSC Technologies Inc., Term Loan
Fair Value, Beginning Balance	177	192
Gross Additions	2	7
Gross Reductions	(8)	(23)
Net change in unrealized gains (losses)	4
Fair Value , Ending Balance	175	177
Interest/ Dividend/ Other Income	7	16
Investment, Identifier [Axis]: Affiliated Investments Golden Bear 2016-R, LLC, Membership Interests
Fair Value, Beginning Balance	9,413	10,038
Gross Additions	106
Net change in unrealized gains (losses)	1,383	(625)
Fair Value , Ending Balance	10,902	9,413
Interest/ Dividend/ Other Income		645
Investment, Identifier [Axis]: Affiliated Investments Pelican Energy, LLC, Common Stock
Fair Value, Beginning Balance	195	630
Gross Reductions		(792)
Net change in unrealized gains (losses)	(0)	357
Fair Value , Ending Balance	195	195
Investment, Identifier [Axis]: Affiliated Investments Renew Financial LLC (f/k/a Renewable Funding, LLC), Common Stock
Gross Additions		2,050
Net change in unrealized gains (losses)		(2,050)
Investment, Identifier [Axis]: Affiliated Investments Renew Financial LLC (f/k/a Renewable Funding, LLC), Preferred Equity
Fair Value, Beginning Balance	1,961
Gross Additions		1,000
Net change in unrealized gains (losses)	(1)	961
Fair Value , Ending Balance	1,960	1,961
Investment, Identifier [Axis]: Affiliated Investments Renew Financial LLC (f/k/a Renewable Funding, LLC), Series E Preferred Stock
Fair Value, Beginning Balance		4,988
Gross Reductions		(2,050)
Net change in unrealized gains (losses)		(2,938)
Fair Value , Ending Balance
Investment, Identifier [Axis]: Affiliated Investments Renew JV LLC, Membership Interests
Fair Value, Beginning Balance	449	613
Gross Reductions	(23)	(82)
Net change in unrealized gains (losses)	2	(81)
Fair Value , Ending Balance	428	449
Investment, Identifier [Axis]: Controlled Investments
Fair Value, Beginning Balance	388,780	481,817
Gross Additions	3,538	116,614
Gross Reductions	(65,425)	(194,113)
Net change in unrealized gains (losses)	1,315	53,726
Fair Value , Ending Balance	328,208	388,780
Net realized gains (losses)		(69,265)
Interest/ Dividend/ Other Income	5,167	27,455
Investment, Identifier [Axis]: Controlled Investments ChyronHego Corporation, Preferred Equity
Fair Value, Beginning Balance	22,500	15,553
Net change in unrealized gains (losses)	890	6,947
Fair Value , Ending Balance	23,390	22,500
Investment, Identifier [Axis]: Controlled Investments ChyronHego Corporation, Revolver
Fair Value, Beginning Balance	8,956	7,076
Gross Additions		1,789
Fair Value , Ending Balance	8,956	8,956
Interest/ Dividend/ Other Income	216	1,044
Investment, Identifier [Axis]: Controlled Investments ChyronHego Corporation, Term Loan
Fair Value, Beginning Balance	91,042	86,969
Gross Additions	626	3,917
Net change in unrealized gains (losses)	(202)	156
Fair Value , Ending Balance	91,466	91,042
Interest/ Dividend/ Other Income	2,420	5,998
Investment, Identifier [Axis]: Controlled Investments ChyronHego US Holding Corporation, Term Loan
Gross Additions	2,912
Net change in unrealized gains (losses)	98
Fair Value , Ending Balance	3,010
Interest/ Dividend/ Other Income	372
Investment, Identifier [Axis]: Controlled Investments Dynamic Product Tankers, LLC, Common Stock
Fair Value, Beginning Balance		3,110
Gross Reductions		(3,063)
Net change in unrealized gains (losses)		41,322
Fair Value , Ending Balance
Net realized gains (losses)		(41,369)
Investment, Identifier [Axis]: Controlled Investments Glacier Oil & Gas Corp. (f/k/a Miller Energy Resources, Inc.), Common Stock
Gross Reductions		(2,182)
Net change in unrealized gains (losses)		30,078
Net realized gains (losses)		(27,896)
Investment, Identifier [Axis]: Controlled Investments Glacier Oil & Gas Corp. (f/k/a Miller Energy Resources, Inc.), Term Loan
Fair Value, Beginning Balance		6,204
Gross Additions		208
Gross Reductions		(7,666)
Net change in unrealized gains (losses)		1,253
Fair Value , Ending Balance
Interest/ Dividend/ Other Income		1,069
Investment, Identifier [Axis]: Controlled Investments MSEA Tankers LLC, Class A Units
Fair Value, Beginning Balance	4,256	34,274
Gross Reductions		(30,862)
Net change in unrealized gains (losses)	(564)	844
Fair Value , Ending Balance	3,692	4,256
Investment, Identifier [Axis]: Controlled Investments Merx Aviation Finance, LLC, Membership Interests
Fair Value, Beginning Balance	111,446	23,509
Gross Additions		110,700
Net change in unrealized gains (losses)	1,193	(22,763)
Fair Value , Ending Balance	112,639	111,446
Investment, Identifier [Axis]: Controlled Investments Merx Aviation Finance, LLC, Revolver
Fair Value, Beginning Balance	150,000	275,000
Gross Reductions	(65,425)	(125,000)
Fair Value , Ending Balance	84,575	150,000
Interest/ Dividend/ Other Income	2,159	16,596
Investment, Identifier [Axis]: Controlled Investments SHD Oil & Gas, LLC, Series C Units
Fair Value, Beginning Balance	580	4,652
Gross Reductions		(612)
Net change in unrealized gains (losses)	(100)	(3,460)
Fair Value , Ending Balance	$ 480	580
Investment, Identifier [Axis]: Controlled Investments SHD Oil & Gas, LLC, Tranche C Note
Fair Value, Beginning Balance		25,470
Gross Reductions		(24,728)
Net change in unrealized gains (losses)		(742)
Fair Value , Ending Balance
Interest/ Dividend/ Other Income		2,747
Investment, Identifier [Axis]: Controlled Investments, ChyronHego Corporation, Revolver
Net change in unrealized gains (losses)		$ 91