Annual report [Section 13 and 15(d), not S-K Item 405]

Investments - Summary of Changes in Assets Measured at Fair Value Using Significant Unobservable Inputs (Details)

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Investments - Summary of Changes in Assets Measured at Fair Value Using Significant Unobservable Inputs (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Change in unrealized appreciation/depreciation on investments for the period included in changes in net assets $ (6,062,300) $ 2,972,084 $ (5,909,772)
Net realized gain on investments for the period included in changes in net assets 5,402,535 3,558,917 (5,312,259)
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ending balance, of Level 3 Assets 69,816,062 55,096,711  
Total realized gains (losses) 6,165,419 (667,688)  
Total unrealized gains (losses) (1,953,255) 2,035,857  
Purchases of securities/changes to securities/non-cash conversions 15,954,233 21,599,244  
Repayments and sales of securities (19,164,418) (8,248,062)  
Ending balance, of Level 3 Assets 70,818,041 69,816,062 55,096,711
Change in unrealized appreciation/depreciation on investments for the period included in changes in net assets (3,825,260) (474,273)  
Level 3 | Clearview Social      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   10,432  
Repayments and sales of securities   (10,432)  
Level 3 | Microcision      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   115,010  
Repayments and sales of securities   (115,010)  
Level 3 | Social Flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (4,941)  
Purchases of securities/changes to securities/non-cash conversions   4,941  
Level 3 | Carolina Skiff      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (500,000) (249,000)  
Level 3 | Mercantile      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   3,440  
Repayments and sales of securities   (3,440)  
Level 3 | Caitec      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (72,522) (300,000)  
Purchases of securities/changes to securities/non-cash conversions 590,424 301,128  
Level 3 | DSD      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 23,699 2,459,819  
Total unrealized gains (losses)   (886,698)  
Purchases of securities/changes to securities/non-cash conversions   31,652  
Repayments and sales of securities (23,699) (6,698,753)  
Level 3 | Knoa      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) (1,229,155)    
Total unrealized gains (losses) 1,129,155    
Level 3 | Mezmeriz      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) (742,850)    
Total unrealized gains (losses) 742,850    
Level 3 | Nailbiter      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Repayments and sales of securities (2,250,000)    
Level 3 | Open Exchange      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses)   (701,940)  
Level 3 | Post Process      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses)   (100,000)  
Level 3 | Rheonix      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (2,802,731)  
Total unrealized gains (losses)   2,802,731  
Level 3 | Somerset      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (448,717)  
Total unrealized gains (losses)   594,097  
Repayments and sales of securities   (270,380)  
Level 3 | First Coast Mulch      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (484,837)    
Purchases of securities/changes to securities/non-cash conversions 46,681 3,818,156  
Level 3 | Filterworks      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (396,226)    
Purchases of securities/changes to securities/non-cash conversions 253,952 247,841  
Repayments and sales of securities (206,250)    
Level 3 | FSS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (610,000) 610,000  
Purchases of securities/changes to securities/non-cash conversions 285,530 4,535,000  
Repayments and sales of securities (34,838) (850,047)  
Level 3 | Swanson      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) 250,000 266,667  
Level 3 | GoNoodle      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 14,314 14,170  
Level 3 | Hilton Displays      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 21,519 22,523  
Repayments and sales of securities   (300,000)  
Level 3 | All About People      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (400,000)    
Purchases of securities/changes to securities/non-cash conversions 125,904 4,049,187  
Level 3 | INEA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 33,995 4,349,839  
Level 3 | ITA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (2,565,130)    
Purchases of securities/changes to securities/non-cash conversions 916,170 612,753  
Level 3 | Mattison      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 5,572,902 37,934  
Repayments and sales of securities (1,894,470)    
Level 3 | Swanson 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions   100,115  
Level 3 | Pressure Pro      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) 720,000    
Purchases of securities/changes to securities/non-cash conversions 66,721 3,093,436  
Repayments and sales of securities (1,427,452)    
Level 3 | Seybert      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 1,928,257 125,569  
Level 3 | Sciaps      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 7,716,461    
Purchases of securities/changes to securities/non-cash conversions   5,000  
Repayments and sales of securities (12,930,445)    
Level 3 | Tilson      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 397,264    
Total unrealized gains (losses) 950,000    
Purchases of securities/changes to securities/non-cash conversions   250,000  
Repayments and sales of securities (397,264)    
Level 3 | MRES      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (716,545)    
Purchases of securities/changes to securities/non-cash conversions 3,216,545    
Level 3 | Mobile IV Nurses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 2,881,319    
Level 3 | Loan investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ending balance, of Level 3 Assets 12,417,977 14,578,351  
Total unrealized gains (losses) (2,565,130)    
Purchases of securities/changes to securities/non-cash conversions 7,079,496 1,011,060  
Repayments and sales of securities (1,894,470) (3,171,434)  
Ending balance, of Level 3 Assets 15,037,873 12,417,977 14,578,351
Level 3 | Loan investments | Caitec      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 590,424 228,606  
Level 3 | Loan investments | DSD      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions   31,652  
Repayments and sales of securities   (3,171,434)  
Level 3 | Loan investments | ITA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (2,565,130)    
Purchases of securities/changes to securities/non-cash conversions 916,170 612,753  
Level 3 | Loan investments | Mattison      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 5,572,902 37,934  
Repayments and sales of securities (1,894,470)    
Level 3 | Loan investments | Swanson 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions   100,115  
Level 3 | Debt investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ending balance, of Level 3 Assets 36,861,525 19,582,616  
Total unrealized gains (losses) (936,837)    
Purchases of securities/changes to securities/non-cash conversions 8,127,573 18,218,956  
Repayments and sales of securities (6,008,540) (940,047)  
Ending balance, of Level 3 Assets 38,043,721 36,861,525 19,582,616
Level 3 | Debt investments | Nailbiter      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Repayments and sales of securities (2,250,000)    
Level 3 | Debt investments | First Coast Mulch      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (484,837)    
Purchases of securities/changes to securities/non-cash conversions 46,681 3,818,156  
Level 3 | Debt investments | Filterworks      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 253,952 247,841  
Repayments and sales of securities (206,250)    
Level 3 | Debt investments | FSS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 177,911 4,535,000  
Repayments and sales of securities (34,838) (640,047)  
Level 3 | Debt investments | GoNoodle      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 14,314 14,170  
Level 3 | Debt investments | Hilton Displays      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 21,519 22,523  
Repayments and sales of securities   (300,000)  
Level 3 | Debt investments | All About People      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 125,904 3,049,187  
Level 3 | Debt investments | INEA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 33,995 3,338,074  
Level 3 | Debt investments | Pressure Pro      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 66,721 3,063,436  
Repayments and sales of securities (1,427,452)    
Level 3 | Debt investments | Seybert      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 1,928,257 125,569  
Level 3 | Debt investments | Sciaps      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions   5,000  
Repayments and sales of securities (2,090,000)    
Level 3 | Debt investments | MRES      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (452,000)    
Purchases of securities/changes to securities/non-cash conversions 2,952,000    
Level 3 | Debt investments | Mobile IV Nurses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions 2,506,319    
Level 3 | Equity investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ending balance, of Level 3 Assets 20,536,560 20,935,744  
Total realized gains (losses) $ 6,165,419 $ (667,688)  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized Gains (Loss) Realized Gains (Loss)  
Total unrealized gains (losses) $ 1,548,712 $ 2,035,857  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Change in unrealized appreciation/depreciation on investments for the period included in changes in net assets Change in unrealized appreciation/depreciation on investments for the period included in changes in net assets  
Purchases of securities/changes to securities/non-cash conversions $ 747,164 $ 2,369,228  
Repayments and sales of securities (11,261,408) (4,136,581)  
Ending balance, of Level 3 Assets 17,736,447 20,536,560 $ 20,935,744
Level 3 | Equity investments | Clearview Social      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   10,432  
Repayments and sales of securities   (10,432)  
Level 3 | Equity investments | Microcision      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   115,010  
Repayments and sales of securities   (115,010)  
Level 3 | Equity investments | Social Flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (4,941)  
Purchases of securities/changes to securities/non-cash conversions   4,941  
Level 3 | Equity investments | Carolina Skiff      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (500,000) (249,000)  
Level 3 | Equity investments | Mercantile      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   3,440  
Repayments and sales of securities   (3,440)  
Level 3 | Equity investments | Caitec      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (72,522) (300,000)  
Purchases of securities/changes to securities/non-cash conversions   72,522  
Level 3 | Equity investments | DSD      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 23,699 2,459,819  
Total unrealized gains (losses)   (886,698)  
Repayments and sales of securities (23,699) (3,527,319)  
Level 3 | Equity investments | Knoa      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) (1,229,155)    
Total unrealized gains (losses) 1,129,155    
Level 3 | Equity investments | Mezmeriz      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) (742,850)    
Total unrealized gains (losses) 742,850    
Level 3 | Equity investments | Open Exchange      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses)   (701,940)  
Level 3 | Equity investments | Post Process      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses)   (100,000)  
Level 3 | Equity investments | Rheonix      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (2,802,731)  
Total unrealized gains (losses)   2,802,731  
Level 3 | Equity investments | Somerset      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses)   (448,717)  
Total unrealized gains (losses)   594,097  
Repayments and sales of securities   (270,380)  
Level 3 | Equity investments | Filterworks      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (396,226)    
Level 3 | Equity investments | FSS      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (610,000) 610,000  
Purchases of securities/changes to securities/non-cash conversions 107,619    
Repayments and sales of securities   (210,000)  
Level 3 | Equity investments | Swanson      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) 250,000 266,667  
Level 3 | Equity investments | All About People      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (400,000)    
Purchases of securities/changes to securities/non-cash conversions   1,000,000  
Level 3 | Equity investments | INEA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions   1,011,765  
Level 3 | Equity investments | Pressure Pro      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) 720,000    
Purchases of securities/changes to securities/non-cash conversions   30,000  
Level 3 | Equity investments | Sciaps      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 7,716,461    
Repayments and sales of securities (10,840,445)    
Level 3 | Equity investments | Tilson      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total realized gains (losses) 397,264    
Total unrealized gains (losses) 950,000    
Purchases of securities/changes to securities/non-cash conversions   $ 250,000  
Repayments and sales of securities (397,264)    
Level 3 | Equity investments | MRES      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total unrealized gains (losses) (264,545)    
Purchases of securities/changes to securities/non-cash conversions 264,545    
Level 3 | Equity investments | Mobile IV Nurses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Purchases of securities/changes to securities/non-cash conversions $ 375,000