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Borrowings (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 15, 2022
Nov. 09, 2021
Dec. 12, 2016
Jan. 14, 2016
Mar. 26, 2013
Mar. 18, 2013
Jan. 17, 2023
Dec. 16, 2021
Dec. 31, 2018
Mar. 18, 2013
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Nov. 15, 2021
Mar. 31, 2018
Mar. 10, 2018
Dec. 30, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 30, 2013
Borrowings (Details) [Line Items]                                            
Asset coverage percentage                     200.00%   200.00%                  
Asset coverage percentage with no approval                         200.00%                  
Revolving credit facility in terms 3 year                                          
Revolving credit facility $ 50,000,000                                          
Outstanding credit facility                         $ 28,200,000   $ 0              
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                         $ 32,241,942 $ 57,500,000                
Gain (loss) on extinguishment of debt                     (296,197)                
Aggregate principal amount $ 22,521,800                                          
Percentage of principal amount 100.00%                                          
Interest and financing expenses                     $ 84,567 $ 0 $ 198,530 $ 0                
Maximum [Member]                                            
Borrowings (Details) [Line Items]                                            
Asset coverage percentage                     263.20%   263.20%   255.00%   200.00%          
Minimum [Member]                                            
Borrowings (Details) [Line Items]                                            
Asset coverage percentage                     200.00%   200.00%       150.00%          
2023 Notes [Member] | Unsecured Debt [Member]                                            
Borrowings (Details) [Line Items]                                            
Aggregate principal amount         $ 3,500,000         $ 60,000,000                        
Percentage of unsecured notes           6.125%       6.125%                 6.125% 6.125% 6.125% 6.125%
Maturity date           Mar. 30, 2023                                
Sale of debt (in Shares)     1,573,872                                      
Redemption price per share (in Dollars per share)     $ 25.03                                      
Net proceeds     $ 38,600,000                                      
Aggregate principal amount               $ 55,325,000 $ 12,000,000             $ 55,325,000   $ 13,000,000        
Gain (loss) on extinguishment of debt               $ 300,000 $ 300,000                          
2023 Notes [Member] | Unsecured Debt [Member] | Maximum [Member]                                            
Borrowings (Details) [Line Items]                                            
Aggregate principal amount     $ 40,000,000                                      
2021 Notes [Member] | Unsecured Debt [Member]                                            
Borrowings (Details) [Line Items]                                            
Aggregate principal amount       $ 3,500,000                                    
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