Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Summary Investment Holdings (Details)

v3.23.3
INVESTMENTS - Summary Investment Holdings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 722,269 [1] $ 656,053 [2]
Fair Value $ 704,815 [1] $ 649,615 [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 $ 273,181 $ 326,524
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 38.80% 50.30%
West    
Summary of Investment Holdings [Line Items]    
Fair Value $ 224,235 $ 169,415
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 31.80% 26.10%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value $ 145,122 $ 118,191
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 20.60% 18.20%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value $ 62,277 $ 35,485
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.80% 5.40%
Diversified/Conglomerate Manufacturing    
Summary of Investment Holdings [Line Items]    
Fair Value $ 158,061 $ 114,105
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 22.40% 17.60%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value $ 146,438 $ 136,401
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 20.80% 21.00%
Diversified/Conglomerate Service    
Summary of Investment Holdings [Line Items]    
Fair Value $ 135,060 $ 148,907
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 19.20% 22.90%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value $ 97,836 $ 88,649
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 13.90% 13.60%
Beverage, Food, and Tobacco    
Summary of Investment Holdings [Line Items]    
Fair Value $ 78,788 $ 64,283
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 11.20% 9.90%
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair Value $ 27,830 $ 25,373
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.90% 3.90%
Automobile    
Summary of Investment Holdings [Line Items]    
Fair Value $ 27,571 $ 20,144
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.90% 3.10%
Personal and Non-Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value $ 14,576 $ 18,583
Personal and Non-Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 2.10% 2.90%
Machinery    
Summary of Investment Holdings [Line Items]    
Fair Value $ 6,411 $ 9,562
Machinery | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.90% 1.50%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value $ 5,868 $ 10,088
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.80% 1.60%
Textiles and Leather    
Summary of Investment Holdings [Line Items]    
Fair Value $ 0 $ 7,978
Textiles and Leather | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.00% 1.20%
Other    
Summary of Investment Holdings [Line Items]    
Fair Value $ 6,376 $ 5,542
Other | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.90% 0.80%
Debt Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 659,826 $ 595,048
Fair Value $ 638,579 $ 579,841
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 91.40% 90.70%
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 90.60% 89.20%
Secured first lien debt    
Summary of Investment Holdings [Line Items]    
Cost $ 529,376 $ 475,806
Fair Value $ 510,701 $ 463,858
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 73.30% 72.50%
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 72.50% 71.40%
Secured second lien debt    
Summary of Investment Holdings [Line Items]    
Cost $ 130,252 $ 118,949
Fair Value $ 127,854 $ 115,928
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.10% 18.20%
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.10% 17.80%
Unsecured debt    
Summary of Investment Holdings [Line Items]    
Cost $ 198 $ 293
Fair Value $ 24 $ 55
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Equity Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 62,443 $ 61,005
Fair Value $ 66,236 $ 69,774
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.60% 9.30%
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 9.40% 10.80%
Preferred equity    
Summary of Investment Holdings [Line Items]    
Cost $ 35,617 $ 34,505
Fair Value $ 26,855 $ 27,046
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.90% 5.30%
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.80% 4.20%
Common equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 26,826 $ 26,500
Fair Value $ 39,381 $ 42,728
Common equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.70% 4.00%
Common equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.60% 6.60%
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.