PORTFOLIO INVESTMENTS AND FAIR VALUE - Fair Values of Investments Disaggregated into Three Levels of Fair Value Hierarchy (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	$ 886,338,148	$ 844,733,638
Senior SecuredLoans-First Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	793,131,815	735,555,508
Senior Secured Loans-Second Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	21,935,000	45,304,300
Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	5,675,605	4,823,898
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	65,595,728	59,049,932
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	886,338,148	844,733,638
Significant Unobservable Inputs (Level 3) | Senior SecuredLoans-First Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	793,131,815	735,555,508
Significant Unobservable Inputs (Level 3) | Senior Secured Loans-Second Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	21,935,000	45,304,300
Significant Unobservable Inputs (Level 3) | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	5,675,605	4,823,898
Significant Unobservable Inputs (Level 3) | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	$ 65,595,728	$ 59,049,932