Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.24.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 21, 2020
$ / shares
May 21, 2020
shares
Mar. 03, 2020
USD ($)
$ / shares
Nov. 30, 2021
USD ($)
Nov. 30, 2019
USD ($)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Apr. 19, 2023
USD ($)
May 20, 2020
shares
Summary of Significant Accounting Policies [Line Items]                          
Minimum percentage of total assets in qualifying assets               70.00% 70.00%        
Reverse stock split   1-for-9 reverse stock split                      
Reverse stock split, ratio   0.1111                      
Common shares, issued | shares   2,648,916       2,648,916 2,648,916 2,648,916 2,648,916       23,845,470
Common shares, outstanding | shares   2,588,800       2,581,021 2,581,021 2,581,021 2,581,021       23,304,424
Percentage of interest income reserve established               100.00%          
Fee income related to amortization of financing fees               $ 205,480 $ 120,914 $ 87,018      
Estimated fees income related to amortization of financing fees year one           $ 169,000   169,000          
Estimated fees income related to amortization of financing fees year two           164,000   164,000          
Estimated fees income related to amortization of financing fees year three           114,000   114,000          
Board fees earned               0 25,000 14,096      
Non-recurring loan monitoring fees                 10,000        
Non-recurring fees related to prepayment fees, loan modification fees and loan monitoring fees               115,264          
Non-recurring fees related to prepayment, application and loan monitoring fees                   55,500      
Original issue discount income               21,008 25,008 112,175      
Estimated original issue discount income in next year           16,000   16,000          
Amortization expense               25,000 12,500        
Estimated amortization of deferred financing fees year one           25,000   25,000          
Estimated Amortization of Deferred Financing Fee Year Two           25,000   25,000          
Estimated amortization of deferred financing fees year three           $ 25,000   25,000          
Amortization of deferred debenture costs               0 0 175,400      
Income taxes paid               645,248 (5,284) (131,934)      
Interest paid               934,638 48,274 567,070      
Interest receivable into investments               $ 1,225,773 739,355 $ 346,045      
Interest receivable and payment-in-kind                 $ 739,356        
Preferred stock authorized | shares           500,000 500,000 500,000 500,000        
Preferred stock, par value | $ / shares           $ 10 $ 10 $ 10 $ 10        
Federal excise tax expense               $ 52,800 $ 0        
Percentage of excise tax               4.00%          
Special Dividend                          
Summary of Significant Accounting Policies [Line Items]                          
Dividends     $ 23,700,000                    
Dividend per share | $ / shares     $ 1.62     $ 0.38 $ 0.18 $ 0.38 $ 0.18        
Dividend declared date     Mar. 03, 2020                    
Dividend record date           Dec. 18, 2023 Dec. 19, 2022            
Dividend payable date     May 11, 2020     Dec. 29, 2023 Dec. 30, 2022            
Cash Dividend                          
Summary of Significant Accounting Policies [Line Items]                          
Percentage of Estimated Investment Taxable Income                     90.00%    
2020 Cash Dividend                          
Summary of Significant Accounting Policies [Line Items]                          
Dividend per share | $ / shares $ 1.33                        
Dividend declared date Dec. 21, 2020                        
Dividend record date Dec. 31, 2020                        
Dividend payable date Jan. 19, 2021                        
U.S. Small Business Administration                          
Summary of Significant Accounting Policies [Line Items]                          
Repayment of outstanding debentures       $ 11,000,000                  
Common Stock                          
Summary of Significant Accounting Policies [Line Items]                          
Authorized repurchase amount                       $ 1,500,000  
Repurchase of common stock | shares               0 0        
Minimum                          
Summary of Significant Accounting Policies [Line Items]                          
Control investments voting securities           25.00%   25.00%          
Control investments voting securities percentage on Board           50.00%   50.00%          
Affiliate investments voting securities           5.00%   5.00%          
Maximum                          
Summary of Significant Accounting Policies [Line Items]                          
Affiliate investments voting securities           25.00%   25.00%          
East Asset Management                          
Summary of Significant Accounting Policies [Line Items]                          
Stock sale transaction cost         $ 25,000,000                
Common stock issued | shares         8,300,000                
Contribution received In form of cash         $ 15,500,000                
Contribution received in form of portfolio assets         $ 9,500,000