Quarterly report pursuant to Section 13 or 15(d)

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 ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Change in unrealized appreciation/depreciation included in earnings related to investments still held at reporting date $ 1,401,973 $ (331,069)
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Ending balance December 31, 2022, of Level 3 Assets 55,096,711 50,167,417
Total realized gain (losses), net 53,388 (1,443,617)
Total unrealized gains   1,628,000
Purchases of securities/changes to securities/non-cash conversions 5,798,979 695,484
Repayments and sales of securities (568,329) (396,558)
Ending balance March 31, 2023, of Level 3 Assets 60,380,749 50,650,726
Change in unrealized appreciation/depreciation included in earnings related to investments still held at reporting date 0 (0)
Level 3 | Clearview Social    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net   38,881
Repayments and sales of securities   (38,881)
Level 3 | Microcision    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net 58,329  
Repayments and sales of securities (58,329)  
Level 3 | Social Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net (4,941) (1,482,498)
Total unrealized gains   1,628,000
Purchases of securities/changes to securities/non-cash conversions 4,941  
Repayments and sales of securities   (267,502)
Level 3 | Caitec    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 18,310 17,944
Level 3 | DSD    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 15,699 333,115
Level 3 | Filterworks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 72,410 61,165
Level 3 | FSS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 2,320,000  
Repayments and sales of securities (210,000)  
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 3,529 3,607
Repayments and sales of securities   (90,175)
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 6,639 6,506
Repayments and sales of securities (300,000)  
Level 3 | ITA    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 44,387 241,021
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 9,283 9,097
Level 3 | Pressure Pro    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 3,019,250  
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 30,781 19,279
Level 3 | Sciaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 3,750 3,750
Level 3 | Tilson    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 250,000  
Level 3 | Loan investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Ending balance December 31, 2022, of Level 3 Assets 14,578,351 15,503,404
Purchases of securities/changes to securities/non-cash conversions 87,679 377,367
Ending balance March 31, 2023, of Level 3 Assets 14,666,030 15,880,771
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 18,310 17,944
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 15,699 333,115
Level 3 | Loan investments | ITA    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions 44,387 17,211
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 9,283 9,097
Level 3 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Ending balance December 31, 2022, of Level 3 Assets 19,582,616 14,030,078
Purchases of securities/changes to securities/non-cash conversions 5,426,359 94,307
Repayments and sales of securities (300,000) (90,175)
Ending balance March 31, 2023, of Level 3 Assets 24,708,975 14,034,210
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 72,410 61,165
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 2,320,000  
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 3,529 3,607
Repayments and sales of securities   (90,175)
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 6,639 6,506
Repayments and sales of securities (300,000)  
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 2,989,250  
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 30,781 19,279
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 3,750 3,750
Level 3 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Ending balance December 31, 2022, of Level 3 Assets 20,935,744 20,633,935
Total realized gain (losses), net 53,388 (1,443,617)
Total unrealized gains   1,628,000
Purchases of securities/changes to securities/non-cash conversions 284,941 223,810
Repayments and sales of securities (268,329) (306,383)
Ending balance March 31, 2023, of Level 3 Assets 21,005,744 20,735,745
Level 3 | Equity investments | Clearview Social    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net   38,881
Repayments and sales of securities   (38,881)
Level 3 | Equity investments | Microcision    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net 58,329  
Repayments and sales of securities (58,329)  
Level 3 | Equity investments | Social Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total realized gain (losses), net (4,941) (1,482,498)
Total unrealized gains   1,628,000
Purchases of securities/changes to securities/non-cash conversions 4,941  
Repayments and sales of securities   (267,502)
Level 3 | Equity investments | FSS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Repayments and sales of securities (210,000)  
Level 3 | Equity investments | ITA    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions   $ 223,810
Level 3 | Equity 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 30,000  
Level 3 | Equity investments | Tilson    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases of securities/changes to securities/non-cash conversions $ 250,000