v3.25.2
Borrowings - Details 1 (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 26, 2023
Apr. 14, 2023
Jan. 27, 2023
Dec. 13, 2022
Nov. 10, 2022
Oct. 27, 2022
Sep. 08, 2022
Aug. 15, 2022
May 10, 2022
Apr. 27, 2022
Jan. 19, 2022
Oct. 04, 2021
Jul. 15, 2021
Mar. 10, 2021
Jan. 28, 2021
Dec. 29, 2020
Jul. 09, 2020
Jul. 13, 2018
May 31, 2025
May 31, 2024
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2023
Mar. 27, 2025
Nov. 30, 2024
Mar. 23, 2018
Line of Credit Facility [Line Items]                                                    
Employ leverage, percentage                                     200.00%              
Asset coverage ratio                                     163.80%   162.90%          
Securitized credit facility                                     $ 70,000,000   $ 52,500,000          
Administrative agent fee                                     1,250,000 $ 1,075,000            
Outstanding borrowings                                     32,400,000 12,900,000            
Financing costs                                     875,791            
Interest expense                                     800,000 300,000            
Amortization of deferred financing cost                                     100,000 50,000.00            
Line of credit facility minimum drawn amount                                         75,000,000          
Commitment amount                                     50,000,000              
Customary fee                                     $ 150,000,000              
Percentage of lender                                     100.00%              
Credit agreement unused commitment, percentage                                     0.50%              
Net income taxes                                     $ 2,762 54,821            
Borrowing amount                                         350,000,000          
Amortization of deferred financing                                       200,000            
Interest expense                                     12,451,865 12,962,081            
Amortization of premium on issuance                                       0.2            
Underwriting commissions                                   $ 1,150,000                
SBIC [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Tangible net                                         24,000,000          
Net income taxes                                         $ 8,000,000          
SBA Debentures [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Interest expense                                     1,300,000 1,800,000            
Additional long-term capital                                     175,000,000              
Weighted average interest rate                                           3.04% 3.36%      
Debt instrument, interest rate, stated percentage                                         150.00%          
7.75% 2025 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                                 $ 300,000                  
Amortization of deferred financing                                     10,000.00 10,000.00            
Aggregate principal amount                                 $ 5,000,000                  
Principal amount, percentage                                 7.75%                  
Net proceeds amount                                 $ 4,800,000                  
Deducting underwriting commissions amount                                 200,000                  
Offering costs                                 $ 100,000                  
Fixed interest, description                                 Interest on the 7.75% 2025 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 7.75% per year.                  
Par value, per share (in Dollars per share)                                         $ 25          
Fair value                                         $ 5,000,000          
Interest expense                                     $ 100,000 100,000            
Debt instrument, interest rate, stated percentage                                     7.75%              
8.50% 2028 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs   $ 2,000,000                                                
Outstanding amount $ 200,000                                                  
Amortization of deferred financing                                       100,000            
Aggregate principal amount 7,500,000 50,000,000                                                
Net proceeds amount $ 7,300,000 48,400,000                                                
Deducting underwriting commissions amount   $ 1,600,000                                                
Par value, per share (in Dollars per share)                                     $ 25              
Fair value                                           $ 5,000,000        
Carrying amount                                           5,000,000        
Interest expense                                     $ 1,200,000 1,200,000            
Debt instrument, interest rate, stated percentage                                     8.50%              
Outstanding fair value                                     $ 57,500,000 57,800,000            
6.25% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                             $ 400,000 $ 100,000                    
Amortization of deferred financing                                       20,000.00            
Aggregate principal amount                             10,000,000 5,000,000                 $ 15,000,000  
Net proceeds amount                             9,700,000                      
Deducting underwriting commissions amount                             300,000                      
Offering costs                             $ 100,000 $ 100,000                    
Fixed interest, description                               Interest on the 6.25% 2027 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 6.25% per year.                    
Par value, per share (in Dollars per share)                             $ 25                      
Fair value                                       64,500,000            
Interest expense                                     $ 200,000 200,000            
Debt instrument, interest rate, stated percentage                               6.25%     6.25%              
Per share (in Dollars per share)                                         $ 25          
Outstanding fair value                                         $ 14,600,000          
6.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs               $ 30,000.00 $ 3,300,000                                  
Interest expense                                     $ 1,600,000 1,600,000            
Aggregate principal amount                   $ 87,500,000                                
Net proceeds amount               7,800,000 9,700,000                                  
Deducting underwriting commissions amount                 $ 300,000                                  
Offering costs                   100,000                                
Fixed interest, description                 Interest on the 6.00% 2027 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 6.00% per year.                                  
Debt instrument, interest rate, stated percentage                                     6.00%              
Outstanding fair value                                     $ 105,500,000 103,100,000            
Offering costs incurred               $ 200,000                                    
Public offering price percentage               97.80%                                    
Deferred financing costs                                     10,000.00 10,000.00            
Amortization of premium on issuance                                     200,000              
Net proceeds                   84,800,000                                
Underwriting commissions                   $ 2,700,000                                
Additional aggregate principal amount               $ 8,000,000 $ 10,000,000                                  
Trading symbol per share (in Dollars per share)                 $ 25                       $ 25          
Aggregate principal amount percentage               6.00%                                    
4.375% 2026 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                         $ 2,700,000 $ 1,300,000                        
Interest expense                                     1,900,000 1,900,000            
Aggregate principal amount                         125,000,000 50,000,000         175,000,000              
Net proceeds amount                         123,800,000 49,000,000                        
Deducting underwriting commissions amount                           $ 1,000,000                        
Offering costs                         $ 200,000                          
Fixed interest, description                           Interest on the 4.375% 2026 Notes is paid semi-annually in arrears on February 28 and August 28, at a rate of 4.375% per year.                        
Fair value                                     $ 163,400,000              
Debt instrument, interest rate, stated percentage                                     4.375%              
Offering costs incurred                           $ 300,000                        
Public offering price percentage                         101.00%                          
Underwriting discounts                         $ 2,500,000                          
Minimum denominations amount                                     $ 2,000              
Integral multiples of excess                                     1,000              
Deferred financing costs                                     200,000 200,000            
Amortization of premium on issuance                                     60,000.00 60,000.00            
4.35% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                     $ 1,800,000                              
Interest expense                                     800,000 800,000            
Aggregate principal amount                     $ 75,000,000               $ 75,000,000              
Principal amount, percentage                     4.35%                              
Net proceeds amount                     $ 73,000,000                              
Deducting underwriting commissions amount                     1,500,000                              
Offering costs                     $ 300,000                              
Fixed interest, description                     Interest on the 4.35% 2027 Notes is paid semi-annually in arrears on February 28 and August 28, at a rate of 4.35% per year.                              
Debt instrument, interest rate, stated percentage                                     4.35%              
Public offering price percentage                     99.317%                              
Deferred financing costs                                           100,000        
Amortization of premium on issuance                                     $ 30,000.00 20,000.00            
7.00% 2025 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs             $ 40,000.00                                      
Amortization of deferred financing                                     40,000.00 30,000.00            
Aggregate principal amount             $ 12,000,000                                      
Principal amount, percentage             7.00%                                      
Net proceeds amount             $ 11,600,000                                      
Fixed interest, description             Interest on the 7.00% 2025 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 7.00% per year.                                      
Interest expense                                     $ 200,000 200,000            
Debt instrument, interest rate, stated percentage                                     7.00%              
Outstanding fair value                                         $ 12,000,000          
Underwriting discounts             $ 400,000                                      
Offering expenses             $ 50,000.00                                      
Amortization of discount on issuance                                       30,000.00            
8.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs         $ 1,700,000                                          
Amortization of deferred financing                                     $ 90,000.00              
Aggregate principal amount           $ 40,000,000                             46,000,000          
Net proceeds amount           38,700,000                                        
Deducting underwriting commissions amount         $ 200,000                                          
Fixed interest, description         Interest on the 8.00% 2027 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 8.00% per year                                          
Fair value                                     11,800,000   46,200,000          
Carrying amount                                     12,000,000              
Interest expense                                     $ 900,000              
Debt instrument, interest rate, stated percentage                                     8.00%              
Offering costs incurred           200,000                                        
Additional aggregate principal amount         $ 6,000,000                                          
Trading symbol per share (in Dollars per share)                                     $ 25              
Underwriting commissions           $ 1,300,000                                        
8.125% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Interest expense                                     $ 1,200,000              
Aggregate principal amount       $ 52,500,000                                            
Principal amount, percentage       8.125%                                            
Net proceeds amount       $ 50,800,000                                            
Deducting underwriting commissions amount       1,600,000                                            
Offering costs       $ 100,000                                            
Fair value                                         61,000,000 60,800,000        
Carrying amount                                         60,400,000 60,400,000        
Debt instrument, interest rate, stated percentage                                     8.125%              
Deferred financing costs                                     $ 100,000 100,000            
Amortization of discount on issuance                                       1,200,000            
Debt instrument, description                                     On December 21, 2022, the underwriters fully exercised their option to purchase an additional $7.9 million in aggregate principal amount of the 8.125% 2027 Notes. Net proceeds to the Company were $7.6 million after deducting underwriting commissions of approximately $0.2 million. Interest on the 8.125% 2027 Notes is paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 8.125% per year. The 8.125% 2027 Notes mature on December 31, 2027 and commencing December 13, 2024, may be redeemed in whole or in part at any time or from time to time at the Company’s option. The net proceeds from this offering were used to make investments in middle-market companies (including investments made through our SBIC Subsidiaries) in accordance with the Company’s investment objective and strategies and for general corporate purposes. Financing costs of $2.0 million related to the 8.125% 2027 Notes have been capitalized and are being amortized over the term of the 8.125% 2027 Notes. The 8.125% 2027 Notes are listed on the NYSE under the trading symbol “SAY” with a par value of $25.00 per noteAs of May 31, 2025, the carrying amount and fair value of the 8.125% 2027 Notes was $60.4 million and $60.8 million, respectively. The fair value of the 8.125% 2027 Notes, which are publicly traded, is based upon closing market quotes as of the measurement date and would be classified as a Level 1 liability within the fair value hierarchy. As of February 28, 2025, the carrying amount and fair value of the 8.125% 2027 Notes was $60.4 million and $61.0 million, respectively.For the three months ended May 31, 2025 and May 31, 2024, the Company recorded $1.2 million and $1.2 million, respectively, of interest expense and $0.1 million and $0.1 million, respectively, of amortization of deferred financing costs related to the 8.125% 2027 Notes. Interest expense and amortization of discount and deferred financing costs are reported as interest and debt financing expense on the consolidated statements of operations. During the three months ended May 31, 2025 and May 31, 2024 the average dollar amount of 8.125% 2027 Notes outstanding was $60.4 million and $60.4 million respectively.              
Fair Value, Inputs, Level 1 [Member] | 4.35% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding fair value                                     $ 70,900,000              
Long-Term Debt [Member] | SBA Debentures [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Debentures outstanding amount                                     170,000,000              
Smaller Enterprise [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Tangible net                                         6,000,000          
Net income taxes                                         2,000,000          
Borrowings [Member] | 7.75% 2025 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding amount                                         5,000,000          
Borrowings [Member] | 4.375% 2026 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Principal amount, percentage                           4.375%                        
Long-Term Debt [Member] | SBA Debentures [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Debentures outstanding amount                                       214,000,000            
Encina Credit Facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Securitized credit facility                       $ 50,000,000                            
Encina credit facility, percentage                       50.00%                            
Floating rate per annum percentage                       4.00%                            
Benchmark rate                       0.75%                            
Credit facility balance, description     ●increased the borrowings available under the Encina Credit Facility from up to $50.0 million to up to $65.0 million; ●changed the underlying benchmark used to compute interest under the Encina Credit Agreement from LIBOR to Term SOFR for a one-month tenor plus a 0.10% credit spread adjustment; ●increased the applicable effective margin rate on borrowings from 4.00% to 4.25%; ●extended the revolving period from October 4, 2024 to January 27, 2026; ●extended the period during which the borrower may request one or more increases in the borrowings available under the Encina Credit Facility (each such increase, a “Facility Increase”) from October 4, 2023 to January 27, 2025, and increased the maximum borrowings available pursuant to the Encina Facility Increase from $75.0 million to $150.0 million; ●revised the eligibility criteria for eligible collateral loans to exclude certain industries in which an obligor or related guarantor may be involved; and ●amended the provisions permitting the borrower to request an extension in the Commitment Termination Date (as defined in the Encina Credit Agreement) to allow requests to extend any applicable Commitment Termination Date, rather than a one-time request to extend the original Commitment Termination Date, subject to a notice requirement.                                              
Administrative agent fee                                     100,000              
Outstanding borrowings                                     32,500,000   32,500,000          
Financing costs                                     2,000,000              
Interest expense                                     800,000       $ 900,000      
Amortization of deferred financing cost                                     $ 100,000 $ 100,000            
Outstanding percentage rate                                     8.50% 9.50%            
Line of credit facility, borrowing capacity, description                                     Availability on the Encina Credit Facility will be subject to a borrowing base calculation, based on, among other things, applicable advance rates (which vary from 50.0% to 75.0% of par or fair value depending on the type of loan asset) and the value of certain “eligible” loan assets included as part of the borrowing base. Funds may be borrowed at the greater of the prevailing one-month SOFR rate, plus an applicable effective margin of 4.25%. In addition, the Company will pay the lender a commitment fee of 0.75% per year (or 0.50% if the ratio of advances outstanding to aggregate commitments is greater than or equal to 50%) on the unused amount of the Encina Credit Facility.              
Line of credit facility minimum drawn amount                                     $ 79,500,000              
Line of credit facility maximum borrowing capacity                                     65,000,000              
Borrowings [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     32,500,000 $ 34,800,000            
Oak Credit Facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Line of credit facility maximum borrowing capacity                                     50,000,000              
Live Oak credit facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     $ 86,800,000              
Outstanding percentage rate                                     50.00%              
Line of credit facility minimum drawn amount                                               $ 12,500,000    
Line of credit facility maximum borrowing capacity                                     $ 25,000,000              
Madison Credit Facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     37,500,000   $ 20,000,000          
SBA Debentures [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     170,000,000              
7.75% 2025 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     5,000,000 5,000,000            
6.25% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     15,000,000 15,000,000            
4.375% 2026 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     175,000,000 175,000,000            
4.375% 2026 Notes [Member] | Level 3 Liability [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding fair value                                     170,700,000              
4.35% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     75,000,000 75,000,000            
6.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     105,500,000 105,500,000            
7.00% 2025 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     12,000,000 12,000,000            
8.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     46,000,000 46,000,000            
8.125% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding borrowings                                     $ 60,400,000 $ 60,400,000            
1940 Act [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Employ leverage, percentage                                     150.00%              
SBIC [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Investment percentage                                         25.00%          
Additional long-term capital                                         $ 175,000,000          
SBIC LP [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding amount                                         350,000,000          
SBIC II LP [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                                           6,000,000        
Aggregate total of equity capital amount                                         87,500,000          
Debentures outstanding amount                                         131,000,000          
Amortization of deferred financing                                     $ 200,000              
SBIC III LP [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Financing costs                                           400,000        
Aggregate total of equity capital amount                                         87,500,000          
Debentures outstanding amount                                         39,000,000          
Minimum [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Asset coverage ratio                                                   150.00%
Encina credit facility                       $ 12,500,000                            
Line of credit facility minimum drawn amount                                     $ 50,000,000              
Investment percentage                                     3.50%              
Minimum [Member] | 6.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Fair value                                           14,200,000        
Outstanding fair value                                         100,700,000          
Minimum [Member] | 8.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Net proceeds amount         $ 5,800,000                                          
Outstanding fair value                                     $ 46,000,000              
Minimum [Member] | Encina Credit Facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding percentage rate                                     8.90%              
Maximum [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Encina credit facility                       $ 25,000,000                            
Line of credit facility minimum drawn amount                                     $ 75,000,000              
Investment percentage                                     4.25%              
Maximum [Member] | SBA Debentures [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Debentures outstanding amount                                         170,000,000          
Maximum [Member] | 6.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Fair value                                           $ 15,000,000        
Outstanding fair value                                         $ 105,500,000          
Maximum [Member] | 8.00% 2027 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding fair value                                     $ 46,900,000              
Maximum [Member] | Encina Credit Facility [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Outstanding percentage rate                                       9.90%            
Securities Financing Transaction, Cost [Member] | 4.375% 2026 Notes [Member]                                                    
Line of Credit Facility [Line Items]                                                    
Deferred financing costs                                       $ 100,000