Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Summary Investment Holdings (Details)

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INVESTMENTS - Summary Investment Holdings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Summary of Investment Holdings [Line Items]    
Cost $ 854,290 [1] $ 720,630 [2]
Fair value $ 920,504 [1] $ 753,543 [2]
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 | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
South    
Summary of Investment Holdings [Line Items]    
Fair value $ 346,838 $ 171,056
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 37.70% 22.70%
West    
Summary of Investment Holdings [Line Items]    
Fair value $ 223,871 $ 197,989
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 24.30% 26.30%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair value $ 207,870 $ 266,612
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.60% 35.40%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair value $ 141,925 $ 117,886
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.40% 15.60%
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair value $ 264,535 $ 268,954
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 28.70% 35.70%
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair value $ 160,038 $ 143,685
Home and Office Furnishings, Housewares, and Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 17.30% 19.10%
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair value $ 92,781 $ 20,088
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.10% 2.70%
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair value $ 77,366 $ 58,713
Hotels, Motels, Inns, and Gaming | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.40% 7.80%
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair value $ 60,431 $ 60,571
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.60% 8.00%
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair value $ 51,171 $ 0
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.60% 0.00%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair value $ 49,638 $ 37,445
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.40% 5.00%
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair value $ 39,350 $ 47,616
Leisure, Amusement, Motion Pictures, and Entertainment | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.30% 6.30%
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair value $ 30,537 $ 25,998
Mining, Steel, Iron and Non-Precious Metals | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.30% 3.50%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair value $ 29,064 $ 22,215
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.20% 2.80%
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair value $ 20,363 $ 24,891
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.20% 3.30%
Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Fair value $ 14,238 $ 0
Printing and Publishing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.50% 0.00%
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Fair value $ 13,500 $ 14,707
Cargo Transport | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.50% 2.00%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair value $ 9,002 $ 18,987
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.00% 2.50%
Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Fair value $ 8,490 $ 9,673
Other less than 2.0% | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.90% 1.30%
Total debt    
Summary of Investment Holdings [Line Items]    
Cost $ 658,383 $ 555,597
Fair value $ 613,559 $ 513,251
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 77.00% 77.10%
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 66.60% 68.20%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 513,425 $ 471,439
Fair value $ 474,856 $ 437,517
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 60.10% 65.40%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 51.60% 58.10%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 144,958 $ 84,158
Fair value $ 138,703 $ 75,734
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 16.90% 11.70%
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.00% 10.10%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 195,907 $ 165,033
Fair value $ 306,945 $ 240,292
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.00% 22.90%
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 33.40% 31.80%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 145,070 $ 149,099
Fair value $ 213,480 $ 222,585
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 17.00% 20.70%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.20% 29.50%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 50,837 $ 15,934
Fair value $ 93,465 $ 17,707
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.00% 2.20%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.20% 2.30%
[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.
[2] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.