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Organization - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 17, 2024
Nov. 30, 2025
Oct. 31, 2025
Jul. 31, 2024
Oct. 31, 2021
Apr. 30, 2021
Mar. 31, 2021
Sep. 30, 2019
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Oct. 29, 2025
Feb. 28, 2025
May 31, 2024
Apr. 30, 2023
Jan. 31, 2021
Debt Instrument [Line Items]                                
Percentage of managed assets invested                 80.00%              
Notes payable to members                 $ 0   $ 700          
Net realized (gain) loss                 1,457 $ 26,674            
Company acquired portfolio                 $ 250,000              
Debt securitization                       $ 21,000   $ 300,700 $ 297,800 $ 300,700
Sale of debt securitization     $ 21,000                          
Common stock shares issued                 0 7,276,000            
Public offering                 $ 0 $ 82,708            
Percentage of public offering price per notes issued         101.50%   99.40%                  
Current ATM Program                                
Debt Instrument [Line Items]                                
Common stock shares issued                 0 7,276,000            
Weighted average price per share of common stock issued                   $ 11.3            
Average Price Per Share Of Common Stock Issued                   $ 11.3            
Proceeds from issuance of common stock                   $ 82,200            
Public offering                 $ 192,200   $ 192,200          
Legal and other offering costs       $ 500,000         $ 0 $ 100            
At The Market Offerings Terminated       250,000                        
Equity Distribution Agreements | Current ATM Program                                
Debt Instrument [Line Items]                                
Aggregate offering price $ 500,000                              
Two Thousand Thirty One Asset Backed Debt [Member]                                
Debt Instrument [Line Items]                                
Debt securitization       351,000                        
Class D Notes                                
Debt Instrument [Line Items]                                
Sale of notes   $ 28,500                            
2026 Notes Payable                                
Debt Instrument [Line Items]                                
Notes payable to members         $ 85,000   $ 100,000                  
Percentage of public offering price per notes issued         101.50%   99.40%                  
Debt instrument, interest rate                 4.25%              
Effective Interest Rate                 4.15%              
Debt instrument, maturity date                 Apr. 01, 2026              
Debt instrument, periodic payment                 semiannually              
PennantPark-TSO Senior Loan Fund, LP                                
Debt Instrument [Line Items]                                
Sale of investments to wholly owned subsidiary           $ 81,400                    
Sale of investments to wholly owned subsidiary in cash           69,500                    
Sale of investments to wholly owned subsidiary in equity interest           $ 11,900                    
Percentage of outstanding class A units           23.08%                    
Net realized (gain) loss           $ 400                    
First Lien Secured Debt | Minimum                                
Debt Instrument [Line Items]                                
Percentage of overall portfolio                 65.00%              
Second Lien Secured Debt | Maximum                                
Debt Instrument [Line Items]                                
Percentage of overall portfolio                 35.00%              
2031 Asset-Backed Debt                                
Debt Instrument [Line Items]                                
Debt securitization retained amount       $ 85,000                        
Percentage of preferred shares of securitization issuer               100.00%                
2031 Asset-Backed Debt | Secured Overnight Financing Rate [Member]                                
Debt Instrument [Line Items]                                
Percentage points added to reference rate                 1.80%              
2031 Asset-Backed Debt | Class B-2 Senior Secured Fixed Rate Notes due 2031                                
Debt Instrument [Line Items]                                
Debt instrument, interest rate               4.30%                
Debt instrument               $ 16,000                
2031 Asset-Backed Debt | Class A1 Senior Secured Floating Rate Loans [Member]                                
Debt Instrument [Line Items]                                
Debt instrument               $ 78,500                
Reference rate description                 three-month SOFR plus 1.8%              
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes                                
Debt Instrument [Line Items]                                
Percentage of notes issued by securitization issuer               100.00%                
2037 Debt Securitization [Member]                                
Debt Instrument [Line Items]                                
Debt securitization retained amount                         $ 85,100      
2037 Debt Securitization [Member] | Class D Notes                                
Debt Instrument [Line Items]                                
Debt securitization retained amount                         28,500      
2037 Asset-Backed Debt                                
Debt Instrument [Line Items]                                
Debt securitization                         $ 474,600