v3.26.1
Borrowings - Schedule of Credit Facility (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2026
Feb. 28, 2026
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Credit Facility with Valley National Bank [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 32,500 $ 32,500                              
Asset Coverage per Unit [1],[3],[4] 1,626 1,684                              
Involuntary Liquidating Preference per Share [1],[3],[5]                              
Average Market Value per Share (in Dollars per share) [1],[3],[6]                              
Credit Facility with Encina Lender Finance, LLC [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[7]   $ 32,500 $ 3,500 $ 32,500 $ 12,500                      
Asset Coverage per Unit [1],[3],[4],[7]   1,629 1,610 1,659 2,093                      
Involuntary Liquidating Preference per Share [1],[3],[5],[7]                        
Average Market Value per Share (in Dollars per share) [1],[3],[6],[7]                        
Credit Facility with Live Oak Banking Company [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 37,500 $ 37,500 $ 20,000                            
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629                            
Involuntary Liquidating Preference per Share [1],[3],[5]                            
Average Market Value per Share (in Dollars per share) [1],[3],[6]                            
Credit Facility with Madison Capital Funding [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[8]             $ 9,600 $ 24,300 $ 20,000 $ 4,500
Asset Coverage per Unit [1],[3],[4],[8]             3,471 6,071 2,345 2,930 2,710 3,025 3,117 3,348 5,421 5,834 20,077
Involuntary Liquidating Preference per Share [1],[3],[5],[8]            
Average Market Value per Share (in Dollars per share) [1],[3],[6],[8]            
7.50% Notes due 2020 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[9]                     $ 61,793 $ 48,300 $ 48,300      
Asset Coverage per Unit [1],[3],[4],[9]                     3,025 3,117 3,348      
Involuntary Liquidating Preference per Share [1],[3],[5],[9]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6],[9]                     $ 25.24 [10] $ 25.46 [10] $ 25.18 [10]      
6.75% Notes due 2023 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[11]               $ 74,451 $ 74,451 $ 74,451            
Asset Coverage per Unit [1],[3],[4],[11]               2,345 2,930 2,710            
Involuntary Liquidating Preference per Share [1],[3],[5],[11]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6],[11]               $ 25.74 [12] $ 26.05 [12] $ 25.89 [12]            
8.75% Notes due 2025 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3]   $ 20,000 $ 20,000                          
Asset Coverage per Unit [1],[3],[4]   1,629 1,610                          
Involuntary Liquidating Preference per Share [1],[3],[5]                            
Average Market Value per Share (in Dollars per share) [1],[3],[6]   [13] $ 25 [14] $ 25 [14]                          
6.25% Notes due 2025 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[15]           $ 60,000 $ 60,000 $ 60,000                
Asset Coverage per Unit [1],[3],[4],[15]           3,471 6,071 2,345                
Involuntary Liquidating Preference per Share [1],[3],[5],[15]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6],[15]           $ 24.24 [16] $ 25.75 [16] $ 24.97 [16]                
7.00% Notes due 2025 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3]   $ 12,000 $ 12,000 $ 12,000                        
Asset Coverage per Unit [1],[3],[4]   1,629 1,610 1,659                        
Involuntary Liquidating Preference per Share [1],[3],[5]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6]   [17] $ 25 [14] $ 25 [14] $ 25 [14]                        
7.25% Notes due 2025 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[18]         $ 43,125 $ 43,125                    
Asset Coverage per Unit [1],[3],[4],[18]         2,093 3,471                    
Involuntary Liquidating Preference per Share [1],[3],[5],[18]                            
Average Market Value per Share (in Dollars per share) [1],[3],[6],[18]         $ 25.46 [16] $ 25.77 [16]                    
7.75% Notes due 2025 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3]     $ 5,000 $ 5,000 $ 5,000                      
Asset Coverage per Unit [1],[3],[4]     1,610 1,659 2,093                      
Involuntary Liquidating Preference per Share [1],[3],[5]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6]     [19] $ 25 [14] $ 25 [14] $ 25 [14]                      
6.25% Notes due 2027 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 15,000 $ 15,000 $ 15,000 $ 15,000 $ 15,000 $ 15,000 $ 5,000                    
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610 1,659 2,093 3,471                    
Involuntary Liquidating Preference per Share [1],[3],[5]                    
Average Market Value per Share (in Dollars per share) [1],[3],[6],[14] $ 25 $ 25 $ 25 $ 25 $ 25 $ 25 $ 25                    
4.375% Notes due 2026 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3],[20]   $ 175,000 $ 175,000 $ 175,000 $ 175,000                      
Asset Coverage per Unit [1],[3],[4],[20]   1,629 1,610 1,659 2,093                      
Involuntary Liquidating Preference per Share [1],[3],[5],[20]                        
Average Market Value per Share (in Dollars per share) [1],[3],[6],[20]   $ 25 [14] $ 25 [14] $ 25 [14] $ 25 [14]                      
4.35% Notes due 2027 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 75,000 $ 75,000 $ 75,000 $ 75,000 $ 75,000 $ 75,000                      
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610 1,659 2,093                      
Involuntary Liquidating Preference per Share [1],[3],[5]                      
Average Market Value per Share (in Dollars per share) [1],[3],[6] $ 25 [14] $ 25 [14] $ 25 [14] $ 25 $ 25 [14] $ 25 [14]                      
6.00% Notes due 2027 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 105,500 $ 105,500 $ 105,500 $ 105,500 $ 105,500                        
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610 1,659                        
Involuntary Liquidating Preference per Share [1],[3],[5]                        
Average Market Value per Share (in Dollars per share) [1],[3],[6],[21] $ 24.86 $ 24.74 $ 24.36 $ 23.51 $ 23.97                        
8.00% Notes due 2027 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 46,000 $ 46,000 $ 46,000 $ 46,000                          
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610                          
Involuntary Liquidating Preference per Share [1],[3],[5]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6],[21] $ 25.49 $ 25.47 $ 25.21 $ 25                          
8.125% Notes due 2027 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 60,375 $ 60,375 $ 60,375 $ 60,375 $ 60,375                        
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610 1,659                        
Involuntary Liquidating Preference per Share [1],[3],[5]                        
Average Market Value per Share (in Dollars per share) [1],[3],[6],[21] $ 25.29 $ 25.37 $ 25.27 $ 25.05 $ 25.1                        
8.50% Notes due 2028 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[3] $ 57,500 [2] $ 57,500 [2] $ 57,500 [2] $ 57,500                          
Asset Coverage per Unit [1],[3],[4] 1,626 1,684 1,629 1,610                          
Involuntary Liquidating Preference per Share [1],[3],[5]                          
Average Market Value per Share (in Dollars per share) [1],[3],[6],[22] $ 25.37 $ 25.39 $ 25.47 $ 25.17                          
7.25% Notes due 2029 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 25,000                                
Asset Coverage per Unit [1],[3],[4] 1,626                                
Involuntary Liquidating Preference per Share [1],[3],[5]                                
Average Market Value per Share (in Dollars per share) [1],[3],[6],[14]                                
7.25% Notes due 2030 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 50,000 $ 50,000                              
Asset Coverage per Unit [1],[3],[4] 1,626 1,684                              
Involuntary Liquidating Preference per Share [1],[3],[5]                              
Average Market Value per Share (in Dollars per share) [1],[3],[6],[14]                              
7.50% Notes due 2031 [Member]                                  
Credit Facility with Valley National Bank                                  
Total Amount Outstanding Exclusive of Treasury Securities [1],[2],[3] $ 100,000 $ 100,000                              
Asset Coverage per Unit [1],[3],[4] 1,626 1,684                              
Involuntary Liquidating Preference per Share [1],[3],[5]                              
Average Market Value per Share (in Dollars per share) [1],[3],[6],[21] $ 25.24 $ 25.29                              
[1] This table does not include the senior securities of our predecessor entity, GSC Investment Corp., relating to a revolving securitized credit facility with Deutsche Bank, in light of the fact that the Company was under different management during the time that such credit facility was outstanding.
[2] Total amount of senior securities outstanding at the end of the period presented.
[3] We have excluded our SBA-guaranteed debentures from this table because the SEC has granted us exemptive relief that permits us to exclude such debentures from the definition of senior securities in the 150% asset coverage ratio we are required to maintain under the 1940 Act.
[4] Asset coverage per unit is the ratio of our total assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness, calculated on a total basis.
[5] The amount to which such class of senior security would be entitled upon the involuntary liquidation of the issuer in preference to any security junior to it. The “—” indicates information which the Securities and Exchange Commission expressly does not require to be disclosed for certain types of senior securities.
[6] Not applicable for credit facility because not registered for public trading.
[7] On November 6, 2025, the Company repaid all remaining amounts outstanding under the Encina Credit Facility and the credit agreement relating to the Encina Credit Facility was terminated.
[8] On October 4, 2021, the Company repaid all remaining amounts outstanding under the Madison Credit Facility and the credit agreement relating to the Madison Credit Facility was terminated.
[9] On January 13, 2017, the Company redeemed in full its 2020 Notes. The Company used a portion of the net proceeds from the 2023 Notes offering, which was completed in December 2016, to redeem the 2020 Notes in full.
[10] Based on the average daily trading price of the 2020 Notes on the NYSE.
[11] On December 21, 2019 and February 7, 2020, the Company redeemed $50.0 million and $24.45 million, respectively, in aggregate principal amount of the $74.45 million in aggregate principal amount of issued and outstanding 2023 Notes.
[12] Based on the average daily trading price of the 2023 Notes on the NYSE.
[13] On March 31, 2025, we repaid $20.0 million in aggregate principal amount of the issued and outstanding 8.75% 2025 Notes.
[14] The carrying value of this unlisted security approximates its fair value, based on a waterfall analysis showing adequate collateral coverage.
[15] On August 31, 2021, the Company redeemed $60.0 million in aggregate principal amount of the issued and outstanding 6.25% 2025 Notes. The Company used a portion of the net proceeds from the 4.375% 2026 Notes offering, which was completed in July 2021, to redeem the 6.25% 2025 Notes in full.
[16] Based on the average daily trading price of the 2025 Notes on the NYSE.
[17] On September 8, 2025, we repaid $12.0 million in aggregate principal amount of the issued and outstanding 7.00% 2025 Notes.
[18] On July 14, 2022, the Company redeemed $43.1 million in aggregate principal amount of the issued and outstanding 7.25% 2025 Notes.
[19] On July 9, 2025, we repaid $5.0 million in aggregate principal amount of the issued and outstanding 7.75% 2025 Notes.
[20] On February 28, 2026, we repaid $175.0 million in aggregate principal amount of the issued and outstanding 4.375% 2026 Notes.
[21] Based on the average daily trading price of the 2027 Notes on the NYSE.
[22] Based on the average daily trading price of the 2028 Notes on the NYSE.