Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Investment Holdings (Details)

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INVESTMENTS - Investment Holdings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Summary of Investment Holdings [Line Items]    
Cost $ 851,866 $ 854,290 [1]
Fair Value 899,138 920,504 [1]
South    
Summary of Investment Holdings [Line Items]    
Fair Value 337,009 346,838
West    
Summary of Investment Holdings [Line Items]    
Fair Value 221,102 223,871
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value 200,803 207,870
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value 140,224 141,925
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair Value 239,139 264,535
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value 165,201 160,038
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair Value 92,527 92,781
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair Value 73,646 77,366
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair Value 61,504 60,431
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair Value 52,818 51,171
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value 49,767 49,638
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair Value 39,814 39,350
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair Value 34,504 30,537
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value 29,067 29,064
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair Value 19,487 20,363
Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Fair Value 14,117 14,238
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Fair Value 13,000 13,500
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value 9,197 9,002
Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Fair Value $ 5,350 $ 8,490
Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 26.60% 28.70%
Investment Owned, At Fair Value | Industry Concentration Risk | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.50% 17.30%
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.30% 10.10%
Investment Owned, At Fair Value | Industry Concentration Risk | Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.20% 8.40%
Investment Owned, At Fair Value | Industry Concentration Risk | Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.80% 6.60%
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.90% 5.60%
Investment Owned, At Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.50% 5.40%
Investment Owned, At Fair Value | Industry Concentration Risk | Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.40% 4.30%
Investment Owned, At Fair Value | Industry Concentration Risk | Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.80% 3.30%
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.20% 3.20%
Investment Owned, At Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.20% 2.20%
Investment Owned, At Fair Value | Industry Concentration Risk | Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.60% 1.50%
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transport    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.40% 1.50%
Investment Owned, At Fair Value | Industry Concentration Risk | Telecommunications    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Investment Owned, At Fair Value | Industry Concentration Risk | Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.60% 0.90%
Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Geographic Regions Risk | South    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 37.50% 37.70%
Investment Owned, At Fair Value | Geographic Regions Risk | West    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 24.60% 24.30%
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.30% 22.60%
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.60% 15.40%
Total debt    
Summary of Investment Holdings [Line Items]    
Cost $ 655,980 $ 658,383
Fair Value $ 601,046 $ 613,559
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 77.00% 77.00%
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 66.80% 66.60%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 511,022 $ 513,425
Fair Value $ 463,219 $ 474,856
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 60.00% 60.10%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 51.50% 51.60%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 144,958 $ 144,958
Fair Value $ 137,827 $ 138,703
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 17.00% 16.90%
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.30% 15.00%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 195,886 $ 195,907
Fair Value $ 298,092 $ 306,945
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.00% 23.00%
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 33.20% 33.40%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 145,070 $ 145,070
Fair Value $ 212,591 $ 213,480
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 17.00% 17.00%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.70% 23.20%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 50,816 $ 50,837
Fair Value $ 85,501 $ 93,465
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.00% 6.00%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 9.50% 10.20%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $180.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $115.8 million. Cumulative net unrealized appreciation is $64.7 million, based on a tax cost of $855.8 million.