| Summary of the Significant Unobservable Inputs to Determine the Fair Value of Level 3 Portfolio Investments | The following table provides a summary of the significant unobservable inputs used to determine the fair value of the Corporation’s Level 3 portfolio investments as of June 30, 2023:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        | 
 Investment Type
 |   | Market Approach EBITDA Multiple |   |   | Market Approach Liquidation Seniority |   |   | Market ApproachRevenue Multiple
 |   |   | Market Approach Transaction Pricing |   |   | Totals |   |  
        | Non-Control/Non-Affiliate Equity |   | $ | 300,000 |   |   | $ | — |   |   | $ | 700,000 |   |   | $ | 200,063 |   |   | $ | 1,200,063 |   |  
        | Non-Control/Non-Affiliate Loan and Debt |   |   | 6,607,700 |   |   |   | 2,208,779 |   |   |   | — |   |   |   | 2,250,000 |   |   |   | 11,066,479 |   |  
        | Total Non-Control/Non-Affiliate |   | $ | 6,907,700 |   |   | $ | 2,208,779 |   |   | $ | 700,000 |   |   | $ | 2,450,063 |   |   | $ | 12,266,542 |   |  
        | Affiliate Equity |   | $ | 4,232,324 |   |   | $ | — |   |   | $ | 3,223,984 |   |   | $ | 10,580,000 |   |   | $ | 18,036,308 |   |  
        | Affiliate Loan and Debt |   |   | 18,200,856 |   |   |   | — |   |   |   | 2,090,000 |   |   |   | 4,763,635 |   |   |   | 25,054,491 |   |  
        | Total Affiliate |   | $ | 22,433,180 |   |   | $ | — |   |   | $ | 5,313,984 |   |   | $ | 15,343,635 |   |   | $ | 43,090,799 |   |  
        | Control Equity |   | $ | — |   |   | $ | — |   |   | $ | — |   |   | $ | — |   |   | $ | — |   |  
        | Control Loan and Debt |   |   | — |   |   |   | 4,031,735 |   |   |   | — |   |   |   | — |   |   |   | 4,031,735 |   |  
        | Total Control |   | $ | — |   |   | $ | 4,031,735 |   |   | $ | — |   |   | $ | — |   |   | $ | 4,031,735 |   |  
        | Total Level 3 Investments |   | $ | 29,340,880 |   |   | $ | 6,240,514 |   |   | $ | 6,013,984 |   |   | $ | 17,793,698 |   |   | $ | 59,389,076 |   |  
        |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Range |   | 5X - 7X |   |   | 1X |   |   | 1X - 4X |   |   | Not Applicable |   |   |   |   |  
        | Unobservable Input |   | EBITDA Multiple |   |   | Asset Value |   |   | Revenue Multiple |   |   | Transaction Price |   |   |   |   |  
        | Weighted Average |   | 5.4X |   |   | 1X |   |   | 1.7X |   |   | Not Applicable |   |   |   |   |  | 
| summary of the components of Assets Measured at Fair Value | The following table provides a summary of the components of Level 1, 2 and 3 Assets Measured at Fair Value at June 30, 2023:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   |   |   |   | Fair Value Measurements at Reported Date Using |   |  
        | 
 
 Description
 |   | June 30, 2023 |   |   | Quoted Prices in Active Markets for Identical Assets(Level 1)
 |   |   | SignificantObservable Inputs
 (Level 2)
 |   |   | Other SignificantUnobservable
 Inputs
 (Level 3)
 |   |  
        | Loan investments |   | $ | 12,038,755 |   |   | $ | — |   |   | $ | — |   |   | $ | 12,038,755 |   |  
        | Debt investments |   |   | 28,113,950 |   |   |   | — |   |   |   | — |   |   |   | 28,113,950 |   |  
        | Equity investments |   |   | 26,639,038 |   |   |   | 7,402,667 |   |   |   | — |   |   |   | 19,236,371 |   |  
        | Total |   | $ | 66,791,743 |   |   | $ | 7,402,667 |   |   | $ | — |   |   | $ | 59,389,076 |   |    The following table provides a summary of the components of Level 1, 2 and 3 Assets Measured at Fair Value at December 31, 2022:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   |   |   |   | Fair Value Measurements at Reported Date Using |   |  
        | 
 
 Description
 |   | December 31, 2022 |   |   | Quoted Prices in Active Markets for Identical Assets(Level 1)
 |   |   | SignificantObservable Inputs
 (Level 2)
 |   |   | Other SignificantUnobservable
 Inputs
 (Level 3)
 |   |  
        | Loan investments |   | $ | 14,578,351 |   |   | $ | — |   |   | $ | — |   |   | $ | 14,578,351 |   |  
        | Debt investments |   |   | 19,582,616 |   |   |   | — |   |   |   | — |   |   |   | 19,582,616 |   |  
        | Equity investments |   |   | 27,343,292 |   |   |   | 6,407,548 |   |   |   | — |   |   |   | 20,935,744 |   |  
        | Total |   | $ | 61,504,259 |   |   | $ | 6,407,548 |   |   | $ | — |   |   | $ | 55,096,711 |   |  | 
| Summary of changes in Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) | The following table provides a summary of changes in Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) for the six months ended June 30, 2023: 
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   | Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
 |   |  
        | Description |   | Loan Investments |   |   | DebtInvestments
 |   |   | EquityInvestments
 |   |   | Total |   |  
        | Ending balance December 31, 2022, of Level 3 Assets |   | $ | 14,578,351 |   |   | $ | 19,582,616 |   |   | $ | 20,935,744 |   |   | $ | 55,096,711 |   |  
        | Realized gains (losses) included in net change in net assets fromoperations:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | ClearView Social, Inc. (Clearview Social) |   |   | — |   |   |   | — |   |   |   | 10,432 |   |   |   | 10,432 |   |  
        | DSD Operating, LLC (DSD) |   |   | — |   |   |   | — |   |   |   | 2,537,765 |   |   |   | 2,537,765 |   |  
        | Microcision, LLC (Microcision) |   |   | — |   |   |   | — |   |   |   | 58,329 |   |   |   | 58,329 |   |  
        | SocialFlow, Inc. (Social Flow) |   |   | — |   |   |   | — |   |   |   | (4,941 | ) |   |   | (4,941 | ) |  
        | Somerset Gas Transmission Company, LLC (Somerset) |   |   | — |   |   |   | — |   |   |   | (448,717 | ) |   |   | (448,717 | ) |  
        | Total realized gains, net |   |   | — |   |   |   | — |   |   |   | 2,152,868 |   |   |   | 2,152,868 |   |  
        | Unrealized gains (losses) included in net change in net assets fromoperations:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | DSD |   |   | — |   |   |   | — |   |   |   | (886,698 | ) |   |   | (886,698 | ) |  
        | Open Exchange, Inc. (Open Exchange) |   |   | — |   |   |   | — |   |   |   | (701,940 | ) |   |   | (701,940 | ) |  
        | Somerset |   |   | — |   |   |   | — |   |   |   | 594,097 |   |   |   | 594,097 |   |  
        | Total unrealized gains (losses) |   |   | — |   |   |   | — |   |   |   | (994,541 | ) |   |   | (994,541 | ) |  
        | Purchases of securities/changes to securities/non-cashconversions:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Caitec, Inc. (Caitec) |   |   | 36,916 |   |   |   | — |   |   |   | — |   |   |   | 36,916 |   |  
        | DSD |   |   | 31,652 |   |   |   | — |   |   |   | — |   |   |   | 31,652 |   |  
        | Filterworks Acquisition USA, LLC (Filterworks) |   |   | — |   |   |   | 147,638 |   |   |   | — |   |   |   | 147,638 |   |  
        | BMP Food Service Supply Holdco, LLC (FSS) |   |   | — |   |   |   | 2,320,000 |   |   |   | — |   |   |   | 2,320,000 |   |  
        | GoNoodle, Inc. (GoNoodle) |   |   | — |   |   |   | 7,067 |   |   |   | — |   |   |   | 7,067 |   |  
        | HDI Acquisition LLC (Hilton Displays) |   |   | — |   |   |   | 11,868 |   |   |   | — |   |   |   | 11,868 |   |  
        | Inter-National Electronic Alloys LLC (INEA) |   |   | — |   |   |   | 3,304,154 |   |   |   | 1,011,765 |   |   |   | 4,315,919 |   |  
        | ITA Acquisition, LLC (ITA) |   |   | 495,528 |   |   |   | — |   |   |   | — |   |   |   | 495,528 |   |  
        | Mattison Avenue Holdings LLC (Mattison) |   |   | 18,716 |   |   |   | — |   |   |   | — |   |   |   | 18,716 |   |  
        | Pressure Pro, Inc. (Pressure Pro) |   |   | — |   |   |   | 3,013,635 |   |   |   | 30,000 |   |   |   | 3,043,635 |   |  
        | Seybert’s Billiards Corporation (Seybert’s) |   |   | — |   |   |   | 62,019 |   |   |   | — |   |   |   | 62,019 |   |  
        | SciAps, Inc. (Sciaps) |   |   | — |   |   |   | 5,000 |   |   |   | — |   |   |   | 5,000 |   |  
        | Social Flow |   |   | — |   |   |   | — |   |   |   | 4,941 |   |   |   | 4,941 |   |  
        | BMP Swanson Holdco, LLC (Swanson) |   |   | 49,026 |   |   |   | — |   |   |   | — |   |   |   | 49,026 |   |  
        | Tilson Technology Management, Inc. (Tilson) |   |   | — |   |   |   | — |   |   |   | 250,000 |   |   |   | 250,000 |   |  
        | Total purchases of securities/changes to securities/non-cashconversions
 |   |   | 631,838 |   |   |   | 8,871,381 |   |   |   | 1,296,706 |   |   |   | 10,799,925 |   |  
        | Repayments and sales of securities: |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Clearview Social |   |   | — |   |   |   | — |   |   |   | (10,432 | ) |   |   | (10,432 | ) |  
        | DSD |   |   | (3,171,434 | ) |   |   | — |   |   |   | (3,605,265 | ) |   |   | (6,776,699 | ) |  
        | FSS |   |   | — |   |   |   | (40,047 | ) |   |   | (210,000 | ) |   |   | (250,047 | ) |  
        | Hilton Displays |   |   | — |   |   |   | (300,000 | ) |   |   | — |   |   |   | (300,000 | ) |  
        | Microcision |   |   | — |   |   |   | — |   |   |   | (58,329 | ) |   |   | (58,329 | ) |  
        | Somerset |   |   | — |   |   |   | — |   |   |   | (270,380 | ) |   |   | (270,380 | ) |  
        | Total repayments and sales of securities |   |   | (3,171,434 | ) |   |   | (340,047 | ) |   |   | (4,154,406 | ) |   |   | (7,665,887 | ) |  
        | Ending balance June 30, 2023, of Level 3 Assets |   | $ | 12,038,755 |   |   | $ | 28,113,950 |   |   | $ | 19,236,371 |   |   | $ | 59,389,076 |   |  
        |   |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Change in unrealized appreciation/depreciation included in earningsrelated to Level 3 investments still held at reporting date
 |   |   |   |   |   |   |   |   |   |   | $ | (701,940 | ) |    The following table provides a summary of changes in Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) for the six months ended June 30, 2022:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   | Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
 |   |  
        | Description
 |   | Loan Investments |   |   | DebtInvestments
 |   |   | EquityInvestments
 |   |   | Total |   |  
        | Ending Balance December 31, 2021, of Level 3 Assets |   | $ | 15,503,404 |   |   | $ | 14,030,078 |   |   | $ | 20,633,935 |   |   | $ | 50,167,417 |   |  
        | Realized gains (losses) included in net change in net assets fromoperations:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | ClearView Social, Inc. (Clearview Social) |   |   | — |   |   |   | — |   |   |   | 38,881 |   |   |   | 38,881 |   |  
        | Microcision, LLC (Microcision) |   |   | — |   |   |   | — |   |   |   | 190,000 |   |   |   | 190,000 |   |  
        | New Monarch Machine Tool, Inc. (New Monarch) |   |   | — |   |   |   | — |   |   |   | (22,841 | ) |   |   | (22,841 | ) |  
        | SocialFlow, Inc. (Social Flow) |   |   | — |   |   |   | — |   |   |   | (1,481,498 | ) |   |   | (1,481,498 | ) |  
        | Total realized (losses), net |   |   | — |   |   |   | — |   |   |   | (1,275,458 | ) |   |   | (1,275,458 | ) |  
        | Unrealized gains included in net change in net assets fromoperations:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Microcision |   |   | — |   |   |   | — |   |   |   | 25,000 |   |   |   | 25,000 |   |  
        | New Monarch |   |   | — |   |   |   | — |   |   |   | 22,841 |   |   |   | 22,841 |   |  
        | Social Flow |   |   | — |   |   |   | — |   |   |   | 1,628,000 |   |   |   | 1,628,000 |   |  
        | Total unrealized gains |   |   | — |   |   |   | — |   |   |   | 1,675,841 |   |   |   | 1,675,841 |   |  
        | Purchases of securities/changes to securities/non-cashconversions:
 |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Caitec, Inc. (Caitec) |   |   | 36,178 |   |   |   | — |   |   |   | — |   |   |   | 36,178 |   |  
        | DSD Operating, LLC (DSD) |   |   | 348,748 |   |   |   | — |   |   |   | — |   |   |   | 348,748 |   |  
        | Filterworks Acquisition USA, LLC (Filterworks) |   |   | — |   |   |   | 107,559 |   |   |   | — |   |   |   | 107,559 |   |  
        | GoNoodle, Inc. (GoNoodle) |   |   | — |   |   |   | 7,110 |   |   |   | — |   |   |   | 7,110 |   |  
        | HDI Acquisition LLC (Hilton Displays) |   |   | — |   |   |   | 13,117 |   |   |   | — |   |   |   | 13,117 |   |  
        | ITA Acquisition, LLC (ITA) |   |   | 34,701 |   |   |   | — |   |   |   | 223,810 |   |   |   | 258,511 |   |  
        | Mattison Avenue Holdings LLC (Mattison) |   |   | 18,341 |   |   |   | — |   |   |   | — |   |   |   | 18,341 |   |  
        | Seybert’s Billiards Corporation (Seybert’s) |   |   | — |   |   |   | 2,248,118 |   |   |   | — |   |   |   | 2,248,118 |   |  
        | SciAps, Inc. (Sciaps) |   |   | — |   |   |   | 7,500 |   |   |   | — |   |   |   | 7,500 |   |  
        | Total purchases of securities/changes to securities/non-cashconversions
 |   |   | 437,968 |   |   |   | 2,383,404 |   |   |   | 223,810 |   |   |   | 3,045,182 |   |  
        | Repayments and sale of securities: |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Clearview Social |   |   | — |   |   |   | — |   |   |   | (38,881 | ) |   |   | (38,881 | ) |  
        | GoNoodle |   |   | — |   |   |   | (90,175 | ) |   |   | — |   |   |   | (90,175 | ) |  
        | Microcision |   |   | — |   |   |   | — |   |   |   | (300,000 | ) |   |   | (300,000 | ) |  
        | Social Flow |   |   | — |   |   |   | — |   |   |   | (268,502 | ) |   |   | (268,502 | ) |  
        | Total repayments and sale of securities |   |   | — |   |   |   | (90,175 | ) |   |   | (607,383 | ) |   |   | (697,558 | ) |  
        | Ending Balance June 30, 2022, of Level 3 Assets |   | $ | 15,941,372 |   |   | $ | 16,323,307 |   |   | $ | 20,650,745 |   |   | $ | 52,915,424 |   |  
        |   |   |   |   |   |   |   |   |   |   |   |   |   |  
        | Change in unrealized appreciation/depreciation included in earningsrelated to Level 3 investments still held at reporting date
 |   |   |   |   |   |   |   |   |   |   | $ | — |   |  |