Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Summary Investment Holdings (Details)

v3.22.4
INVESTMENTS - Summary Investment Holdings (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2022
Mar. 31, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 722,380 $ 669,248 [1]
Fair Value $ 760,463 $ 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%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value $ 273,897 $ 194,100
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 36.00% 27.20%
West    
Summary of Investment Holdings [Line Items]    
Fair Value $ 198,589 $ 158,607
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 26.10% 22.20%
South    
Summary of Investment Holdings [Line Items]    
Fair Value $ 173,259 $ 188,978
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.80% 26.40%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value $ 114,718 $ 172,711
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.10% 24.20%
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair Value $ 269,749 $ 307,403
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 35.50% 43.00%
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value $ 147,533 $ 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 19.40% 17.60%
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair Value $ 63,127 $ 0
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.30% 0.00%
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair Value $ 59,308 $ 37,923
Hotels, Motels, Inns, and Gaming | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 7.80% 5.30%
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair Value $ 48,146 $ 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 6.30% 6.50%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value $ 37,638 $ 39,252
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.00% 5.50%
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair Value $ 26,618 $ 26,618
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.50% 3.70%
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair Value $ 23,044 $ 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 3.00% 3.40%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value $ 20,891 $ 25,296
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.70% 3.50%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value $ 19,453 $ 32,467
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.60% 4.60%
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair Value $ 18,109 $ 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 $ 15,265 $ 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 $ 9,140 $ 14,064
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.20% 2.00%
Other    
Summary of Investment Holdings [Line Items]    
Fair Value $ 2,442 $ 6,813
Other | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.30% 1.00%
Debt Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 557,347 $ 510,604
Fair Value $ 523,660 $ 493,045
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 77.20% 76.30%
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 68.80% 69.00%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 473,189 $ 429,457
Fair Value $ 447,491 $ 425,087
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 65.50% 64.20%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 58.80% 59.50%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 84,158 $ 81,147
Fair Value $ 76,169 $ 67,958
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 11.70% 12.10%
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.00% 9.50%
Equity Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 165,033 $ 158,644
Fair Value $ 236,803 $ 221,351
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.80% 23.70%
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 31.20% 31.00%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 149,099 $ 143,079
Fair Value $ 221,774 $ 217,599
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 20.60% 21.40%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 29.20% 30.50%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 15,934 $ 15,565
Fair Value $ 15,029 $ 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 2.00% 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.