Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Summary Investment Holdings (Details)

v3.23.1
INVESTMENTS - Summary Investment Holdings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 720,630 [1] $ 669,248 [2]
Fair value $ 753,543 [1] $ 714,396 [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%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair value $ 266,612 $ 194,100
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 35.40% 27.20%
West    
Summary of Investment Holdings [Line Items]    
Fair value $ 197,989 $ 158,607
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 26.30% 22.20%
South    
Summary of Investment Holdings [Line Items]    
Fair value $ 171,056 $ 188,978
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.70% 26.40%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair value $ 117,886 $ 172,711
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 15.60% 24.20%
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair value $ 268,954 $ 307,403
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 35.70% 43.00%
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair value $ 143,685 $ 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 19.10% 17.60%
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair value $ 60,571 $ 0
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.00% 0.00%
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair value $ 58,713 $ 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 $ 47,616 $ 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 $ 37,445 $ 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%
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair value $ 25,998 $ 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 3.50% 3.40%
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair value $ 24,891 $ 26,618
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.30% 3.70%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair value $ 22,215 $ 25,296
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.80% 3.50%
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair value $ 20,088 $ 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 2.70% 1.90%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair value $ 18,987 $ 32,467
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.50% 4.60%
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Fair value $ 14,707 $ 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 $ 9,646 $ 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 less than 2.0%    
Summary of Investment Holdings [Line Items]    
Fair value $ 27 $ 6,813
Other less than 2.0% | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.00% 1.00%
Total debt    
Summary of Investment Holdings [Line Items]    
Cost $ 555,597 $ 510,604
Fair value $ 513,251 $ 493,045
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 77.10% 76.30%
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 68.20% 69.00%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 471,439 $ 429,457
Fair value $ 437,517 $ 425,087
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 65.40% 64.20%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 58.10% 59.50%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 84,158 $ 81,147
Fair value $ 75,734 $ 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 10.10% 9.50%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 165,033 $ 158,644
Fair value $ 240,292 $ 221,351
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.90% 23.70%
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 31.80% 31.00%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 149,099 $ 143,079
Fair value $ 222,585 $ 217,599
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 20.70% 21.40%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 29.50% 30.50%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 15,934 $ 15,565
Fair value $ 17,707 $ 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 2.30% 0.50%
[1] 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.
[2] 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.