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BORROWINGS - Narrative (Details)
1 Months Ended 3 Months Ended
Mar. 20, 2024
USD ($)
Mar. 01, 2024
Aug. 02, 2023
USD ($)
Apr. 20, 2021
USD ($)
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2024
USD ($)
facility
Jun. 30, 2023
USD ($)
Jun. 20, 2024
USD ($)
Jun. 19, 2024
USD ($)
Dec. 20, 2023
USD ($)
Dec. 07, 2023
USD ($)
lender
Dec. 06, 2023
USD ($)
Aug. 01, 2023
USD ($)
Nov. 22, 2022
USD ($)
Jan. 28, 2022
USD ($)
Nov. 30, 2021
USD ($)
May 25, 2021
USD ($)
Feb. 28, 2021
USD ($)
Apr. 25, 2019
Debt Instrument [Line Items]                                        
Asset coverage ratio                                       166.00%
Current asset coverage ratio             232.00%                          
January 2026 Notes | Notes                                        
Debt Instrument [Line Items]                                        
Weighted average effective interest rate             4.46% 4.46%                        
Interest expense             $ 1,659,000 $ 1,659,000                        
Aggregate principal amount           $ 75,000,000                         $ 65,000,000  
Fixed interest rate           4.50%                            
Average borrowings             $ 140,000,000 $ 140,000,000                        
Issuance price percent received                                     102.11%  
Yield-to-maturity                                     4.00%  
Redemption price, percentage           100.00%                            
October 2026 Notes | Notes                                        
Debt Instrument [Line Items]                                        
Weighted average effective interest rate             3.50% 3.50%                        
Interest expense             $ 1,458,000 $ 1,451,000                        
Aggregate principal amount         $ 100,000,000                       $ 50,000,000      
Fixed interest rate         3.375%                       3.375%      
Average borrowings             $ 150,000,000 $ 150,000,000                        
Issuance price percent received         99.418%                       99.993%      
Yield-to-maturity         3.50%                       3.375%      
Redemption price, percentage         100.00%                              
August 2028 Notes | Notes                                        
Debt Instrument [Line Items]                                        
Weighted average effective interest rate             7.75% 7.75%                        
Interest expense             $ 1,520,000 $ 289,000                        
Aggregate principal amount               $ 71,900,000                        
Fixed interest rate               7.75%                        
Average borrowings             $ 71,875,000 $ 71,785,000                        
August 2028 Notes Overallotment | Notes                                        
Debt Instrument [Line Items]                                        
Aggregate principal amount               $ 9,400,000                        
SBA Debentures | Unsecured Debt                                        
Debt Instrument [Line Items]                                        
Weighted average effective interest rate             4.38% 3.94%                        
Interest expense             $ 1,861,000 $ 1,363,000                        
Average borrowings             153,000,000 $ 123,681,000                        
SBA Debentures | Unsecured Debt | SBIC I                                        
Debt Instrument [Line Items]                                        
Maturity       10 years                                
Regulatory maximum borrowing capacity       $ 175,000,000                                
Regulatory capital       $ 87,500,000     87,500,000                          
Leverage commitment amount             175,000,000       $ 45,000,000       $ 50,000,000 $ 40,000,000   $ 40,000,000    
Available leverage commitment             87,500,000                          
Unused commitments             $ 22,000,000                          
Corporate Credit Facility | Line of Credit                                        
Debt Instrument [Line Items]                                        
Weighted average effective interest rate             7.79%                          
Average borrowings             $ 236,900,000                          
Corporate Credit Facility | Corporate Credit Facility | Line of Credit                                        
Debt Instrument [Line Items]                                        
Number of revolving credit facility | facility             1                          
Weighted average effective interest rate             7.75% 7.36%                        
Average borrowings             $ 190,604,000 $ 239,725,000                        
Basis spread on variable rate     2.15%                                  
Maximum borrowing capacity     $ 435,000,000                 $ 460,000,000 $ 435,000,000 $ 400,000,000            
Accordion feature increase limit     $ 750,000,000                 $ 25,000,000                
Number of lenders | lender                       10                
Minimum senior coverage ratio   2.00                                    
Maximum asset coverage ratio   1.50                                    
Interest coverage ratio   2.00                                    
Interest expense             $ 4,635,000 $ 4,915,000                        
Corporate Credit Facility | Corporate Credit Facility | Line of Credit | Minimum                                        
Debt Instrument [Line Items]                                        
Commitment fee percentage   0.50%                                    
Corporate Credit Facility | Corporate Credit Facility | Line of Credit | Maximum                                        
Debt Instrument [Line Items]                                        
Commitment fee percentage   1.00%                                    
Secured Debt | SPV Credit Facility | Line of Credit                                        
Debt Instrument [Line Items]                                        
Number of revolving credit facility | facility             1                          
Weighted average effective interest rate             7.92% 0.00%                        
Average borrowings             $ 46,275,000 $ 0                        
Maximum borrowing capacity $ 150,000,000                 $ 150,000,000                    
Accordion feature increase limit                 $ 200,000,000                      
Accordion feature that allows increases (up to) $ 400,000,000                                      
Interest expense             $ 1,306,000 $ 0                        
Secured Debt | SPV Credit Facility | Line of Credit | Before March 20 2027                                        
Debt Instrument [Line Items]                                        
Basis spread on variable rate 2.50%                                      
Secured Debt | SPV Credit Facility | Line of Credit | After March 20 2027                                        
Debt Instrument [Line Items]                                        
Basis spread on variable rate 2.85%                                      
Secured Debt | SPV Credit Facility | Line of Credit | Before April 20 2024                                        
Debt Instrument [Line Items]                                        
Commitment fee percentage 0.10%                                      
Secured Debt | SPV Credit Facility | Line of Credit | After April 20 2024                                        
Debt Instrument [Line Items]                                        
Commitment fee percentage 0.35%