Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Summary Investment Holdings (Details)

v3.22.2.2
INVESTMENTS - Summary Investment Holdings (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 703,218 $ 669,248 [1]
Fair Value $ 737,935 $ 714,396 [1]
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%
West    
Summary of Investment Holdings [Line Items]    
Fair Value $ 236,774 $ 158,607
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 32.10% 22.20%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value $ 218,107 $ 194,100
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 29.60% 27.20%
South    
Summary of Investment Holdings [Line Items]    
Fair Value $ 172,784 $ 188,978
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.40% 26.40%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value $ 110,270 $ 172,711
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 14.90% 24.20%
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair Value $ 267,913 $ 307,403
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 36.30% 43.00%
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value $ 133,359 $ 125,440
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 18.10% 17.60%
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair Value $ 60,050 $ 0
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.10% 0.00%
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair Value $ 53,090 $ 37,923
Hotels, Motels, Inns, and Gaming | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 7.20% 5.30%
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair Value $ 45,169 $ 46,514
Leisure, Amusement, Motion Pictures, and Entertainment | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.10% 6.50%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value $ 38,937 $ 39,252
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.30% 5.50%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value $ 23,746 $ 25,296
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.20% 3.50%
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair Value $ 23,642 $ 26,618
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.20% 3.70%
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair Value $ 23,368 $ 24,250
Mining, Steel, Iron and Non-Precious Metals | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.20% 3.40%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value $ 23,200 $ 32,467
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.10% 4.60%
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair Value $ 17,407 $ 13,823
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 2.40% 1.90%
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Fair Value $ 14,827 $ 14,533
Cargo Transport | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.00% 2.00%
Diversified/Conglomerate Manufacturing    
Summary of Investment Holdings [Line Items]    
Fair Value $ 9,259 $ 14,064
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.30% 2.00%
Other    
Summary of Investment Holdings [Line Items]    
Fair Value $ 3,968 $ 6,813
Other | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.50% 1.00%
Debt Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 538,563 $ 510,604
Fair Value $ 497,658 $ 493,045
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 76.60% 76.30%
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 67.40% 69.00%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 444,089 $ 429,457
Fair Value $ 420,907 $ 425,087
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 63.20% 64.20%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 57.00% 59.50%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 94,474 $ 81,147
Fair Value $ 76,751 $ 67,958
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 13.40% 12.10%
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.40% 9.50%
Equity Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 164,655 $ 158,644
Fair Value $ 240,277 $ 221,351
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 23.40% 23.70%
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 32.60% 31.00%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 149,099 $ 143,079
Fair Value $ 229,430 $ 217,599
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 21.20% 21.40%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 31.10% 30.50%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 15,556 $ 15,565
Fair Value $ 10,847 $ 3,752
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.20% 2.30%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.50% 0.50%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $140.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $97.1 million. Cumulative net unrealized appreciation is $43.8 million, based on a tax cost of $670.6 million.