Quarterly report [Sections 13 or 15(d)]

INVESTMENTS - Schedule of Investment Concentrations (Details)

v3.25.4
INVESTMENTS - Schedule of Investment Concentrations (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2025
Mar. 31, 2025
Summary of Investment Holdings [Line Items]    
Investments, cost $ 1,058,898 $ 939,066 [1]
Investments at fair value 1,222,792 979,320 [1]
South    
Summary of Investment Holdings [Line Items]    
Investments at fair value 552,028 317,294
West    
Summary of Investment Holdings [Line Items]    
Investments at fair value 232,000 222,062
Midwest    
Summary of Investment Holdings [Line Items]    
Investments at fair value 214,196 227,415
Northeast    
Summary of Investment Holdings [Line Items]    
Investments at fair value 199,389 182,669
Canada    
Summary of Investment Holdings [Line Items]    
Investments at fair value 25,179 29,880
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Investments at fair value 194,985 170,360
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Investments at fair value 177,420 107,869
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Investments at fair value 166,499 159,236
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Investments at fair value 144,712 105,432
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Investments at fair value 124,804 69,589
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Investments at fair value 104,103 78,460
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Investments at fair value 71,450 69,320
Electronics    
Summary of Investment Holdings [Line Items]    
Investments at fair value 67,587 71,573
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Investments at fair value 51,665 11,612
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Investments at fair value 44,920 51,501
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Investments at fair value 36,882 41,010
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Investments at fair value 9,933 12,624
Telecommunications    
Summary of Investment Holdings [Line Items]    
Investments at fair value 8,241 7,585
Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Investments at fair value 7,873 11,681
Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Investments at fair value $ 11,718 $ 11,468
Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 100.00% 100.00%
Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 100.00% 100.00%
Investment Owned, at Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 100.00% 100.00%
Investment Owned, at Fair Value | Industry Concentration Risk | Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 15.90% 17.40%
Investment Owned, at Fair Value | Industry Concentration Risk | Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 14.50% 10.90%
Investment Owned, at Fair Value | Industry Concentration Risk | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 13.70% 16.30%
Investment Owned, at Fair Value | Industry Concentration Risk | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 11.90% 10.80%
Investment Owned, at Fair Value | Industry Concentration Risk | Oil and Gas    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 10.20% 7.10%
Investment Owned, at Fair Value | Industry Concentration Risk | Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 8.50% 8.00%
Investment Owned, at Fair Value | Industry Concentration Risk | Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.80% 7.10%
Investment Owned, at Fair Value | Industry Concentration Risk | Electronics    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.50% 7.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 4.20% 1.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 3.70% 5.30%
Investment Owned, at Fair Value | Industry Concentration Risk | Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 3.00% 4.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Cargo Transport    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.80% 1.30%
Investment Owned, at Fair Value | Industry Concentration Risk | Telecommunications    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.70% 0.80%
Investment Owned, at Fair Value | Industry Concentration Risk | Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.60% 1.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 1.00% 1.20%
Investment Owned, at Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 100.00% 100.00%
Investment Owned, at Fair Value | Geographic Regions Risk | South    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 45.10% 32.40%
Investment Owned, at Fair Value | Geographic Regions Risk | West    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 19.00% 22.70%
Investment Owned, at Fair Value | Geographic Regions Risk | Midwest    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 17.50% 23.20%
Investment Owned, at Fair Value | Geographic Regions Risk | Northeast    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 16.30% 18.70%
Investment Owned, at Fair Value | Geographic Regions Risk | Canada    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 2.10% 3.00%
Total debt    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 751,898 $ 687,982
Investments at fair value $ 694,789 $ 617,914
Total debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 71.00% 73.30%
Total debt | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 56.80% 63.10%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 658,558 $ 584,026
Investments at fair value $ 604,516 $ 514,334
Secured First Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 62.20% 62.20%
Secured First Lien Debt | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 49.40% 52.50%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 93,340 $ 103,956
Investments at fair value $ 90,273 $ 103,580
Secured Second Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 8.80% 11.10%
Secured Second Lien Debt | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 7.40% 10.60%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 307,000 $ 251,084
Investments at fair value $ 528,003 $ 361,406
Total equity/equivalents | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 29.00% 26.70%
Total equity/equivalents | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 43.20% 36.90%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 257,403 $ 201,487
Investments at fair value $ 429,702 $ 302,163
Preferred Equity | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 24.30% 21.50%
Preferred Equity | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 35.20% 30.90%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Investments, cost $ 49,597 $ 49,597
Investments at fair value $ 98,301 $ 59,243
Common Equity/ Equivalents | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 4.70% 5.20%
Common Equity/ Equivalents | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 8.00% 6.00%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $183.3 million; cumulative gross unrealized depreciation for federal income tax purposes is $144.9 million. Cumulative net unrealized appreciation is $38.5 million, based on a tax cost of $940.9 million.