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
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 640,776 $ 656,053
Fair Value $ 621,739 $ 649,615
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 $ 301,962 $ 326,524
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 48.60% 50.30%
West    
Summary of Investment Holdings [Line Items]    
Fair Value $ 169,476 $ 169,415
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 27.20% 26.10%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value $ 115,006 $ 118,191
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.50% 18.20%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value $ 35,295 $ 35,485
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.70% 5.40%
Diversified/Conglomerate Service    
Summary of Investment Holdings [Line Items]    
Fair Value $ 134,598 $ 148,907
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 21.60% 22.90%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value $ 132,507 $ 136,401
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 21.30% 21.00%
Diversified/Conglomerate Manufacturing    
Summary of Investment Holdings [Line Items]    
Fair Value $ 113,571 $ 114,105
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.30% 17.60%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value $ 86,118 $ 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 $ 65,218 $ 64,283
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 10.50% 9.90%
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair Value $ 24,914 $ 25,373
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.00% 3.90%
Automobile    
Summary of Investment Holdings [Line Items]    
Fair Value $ 19,469 $ 20,144
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.10% 3.10%
Personal and Non-Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value $ 19,211 $ 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 3.10% 2.90%
Machinery    
Summary of Investment Holdings [Line Items]    
Fair Value $ 9,861 $ 9,562
Machinery | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.60% 1.50%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value $ 8,025 $ 10,088
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.30% 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 $ 8,247 $ 5,542
Other | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 1.30% 0.80%
Debt Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 583,477 $ 595,048
Fair Value $ 567,401 $ 579,841
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 91.10% 90.70%
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 91.30% 89.20%
Secured first lien debt    
Summary of Investment Holdings [Line Items]    
Cost $ 462,543 $ 475,806
Fair Value $ 450,243 $ 463,858
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 72.20% 72.50%
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 72.40% 71.40%
Secured second lien debt    
Summary of Investment Holdings [Line Items]    
Cost $ 118,320 $ 118,949
Fair Value $ 114,755 $ 115,928
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.50% 18.20%
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 18.50% 17.80%
Unsecured debt    
Summary of Investment Holdings [Line Items]    
Cost $ 2,614 $ 293
Fair Value $ 2,403 $ 55
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.40% 0.00%
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 0.40% 0.00%
Equity Securities    
Summary of Investment Holdings [Line Items]    
Cost $ 57,299 $ 61,005
Fair Value $ 54,338 $ 69,774
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.90% 9.30%
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 8.70% 10.80%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 34,505 $ 34,505
Fair Value $ 26,140 $ 27,046
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.40% 5.30%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.20% 4.20%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 22,794 $ 26,500
Fair Value $ 28,198 $ 42,728
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 3.50% 4.00%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.50% 6.60%