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Borrowings (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 15, 2022
Dec. 16, 2021
Nov. 09, 2021
Mar. 10, 2018
Dec. 12, 2016
Mar. 26, 2013
Mar. 18, 2013
Dec. 31, 2023
Sep. 30, 2023
Nov. 15, 2021
Dec. 31, 2018
Mar. 31, 2018
Dec. 30, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 30, 2013
Borrowings (Details) [Line Items]                                
Asset coverage percentage               275.40% 270.70%              
Asset coverage percentage with no approval               200.00%                
Revolving credit facility in terms 3 years                              
Revolving credit facility $ 50,000,000                              
Outstanding credit facility               $ 28,400,000 $ 28,400,000              
Interest rate               2.90%                
Commitment fee percentage               0.25%                
Credit facility borrowing, description               the Company borrowed $23.2 million under the Credit Facility and used these proceeds to redeem $22.6 million in aggregate principal amount of the issued and outstanding 2023 Notes, comprising all issued and outstanding 2023 Notes. The 2023 Notes were redeemed at 100% of their principal amount, plus accrued and unpaid interest thereon from September 30, 2022 through, but excluding January 17, 2023 (the “Redemption Date”).                
Aggregate principal amount $ 22,521,800                              
Percentage of principal amount 100.00%                              
Maximum [Member]                                
Borrowings (Details) [Line Items]                                
Asset coverage percentage                       200.00%        
Minimum [Member]                                
Borrowings (Details) [Line Items]                                
Asset coverage percentage               200.00%       150.00%        
Borrowings [Member]                                
Borrowings (Details) [Line Items]                                
Asset coverage percentage               200.00%                
2023 Notes [Member] | Unsecured Debt [Member]                                
Borrowings (Details) [Line Items]                                
Aggregate principal amount         $ 40,000,000 $ 3,500,000 $ 60,000,000                  
Percentage of unsecured notes             6.125%           6.125% 6.125% 6.125% 6.125%
Maturity date             Mar. 30, 2023                  
Sale of debt         1,573,872                      
Redemption price per share         $ 25.03                      
Net proceeds         $ 38,600,000                      
Aggregate principal amount   $ 55,325,000   $ 13,000,000           $ 55,325,000 $ 12,000,000          
Gain (loss) on extinguishment of debt   $ 300,000   $ 300,000                        
2028 Notes [Member] | Underwriters [Member]                                
Borrowings (Details) [Line Items]                                
Aggregate principal amount     $ 7,500,000                          
2028 Notes [Member] | Unsecured Debt [Member]                                
Borrowings (Details) [Line Items]                                
Aggregate principal amount     $ 57,500,000                          
Percentage of unsecured notes     5.25%                          
Maturity date     Nov. 01, 2028