PORTFOLIO INVESTMENTS AND FAIR VALUE - Fair values of investments disaggregated into three levels of fair value hierarchy (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	$ 871,733,280	$ 772,873,326
Senior SecuredLoans-First Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	742,272,654	646,352,935
Senior Secured Loans-Second Lien
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	58,220,675	56,733,110
Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	4,760,750	4,883,854
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	66,479,201	64,903,427
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	871,733,280	772,873,326
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	742,272,654	646,352,935
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	58,220,675	56,733,110
Significant Unobservable Inputs (Level 3) | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	4,760,750	4,883,854
Significant Unobservable Inputs (Level 3) | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	$ 66,479,201	$ 64,903,427