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Investments - Summary of Changes in Portfolio Investment Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 - USD ($) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ending balance, of Level 3 Assets | $ 48,480,496 | $ 70,818,041
Total realized gains, net | 1,075,571 | 925,332
Total unrealized (losses) gains | (2,040,116) | (1,298,384)
Purchases of securities/changes to securities/non-cash conversions | 5,375,854 | 1,037,607
Repayments and sales of securities | (1,348,741) | (9,325,233)
Ending balance, of Level 3 Assets | 51,543,064 | 62,157,363
Change in unrealized appreciation/depreciation included in earnings related to Level 3 investments still held at reporting date | (988,457) | (578,384)
Autotality (formerly Filterworks Acquisition USA, LLC) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (1,023,457) |
Purchases of securities/changes to securities/non-cash conversions | 123,886 | 58,573
Bauer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | 288,000 |
Purchases of securities/changes to securities/non-cash conversions | 600 |
BlackJet |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (250,000) |
Purchases of securities/changes to securities/non-cash conversions | 5,642 |
AME Holdco, LLC |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 4,000,000 |
Swanson |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 32,964 |
FSS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | (247,619)
Purchases of securities/changes to securities/non-cash conversions | 400,000 | 212,770
Caitec |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 75,292 | 158,454
Carolina Skiff |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net | 3,112 |
Repayments and sales of securities | (3,112) |
FCM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 13,521 | 12,222
GoNoodle |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | (25)
Purchases of securities/changes to securities/non-cash conversions | 3,637 | 3,601
Hilton Displays |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities |  | (1,071,824)
Highland |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | 400,000 |
Purchases of securities/changes to securities/non-cash conversions | 33,058 | 31,751
EFINEA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | 288,235
ITA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | (875,000)
Purchases of securities/changes to securities/non-cash conversions |  | 375,000
Mattison |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities |  | (5,572,902)
Microcision |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | 55,357
Repayments and sales of securities |  | (55,357)
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 | 6,330 | 6,266
MRES |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (403,000) |
Purchases of securities/changes to securities/non-cash conversions | 680,924 | 124,575
Pressure Pro |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | 870,000
Total unrealized (losses) gains |  | (720,000)
Purchases of securities/changes to securities/non-cash conversions |  | 22,445
Repayments and sales of securities |  | (2,625,150)
Seybert |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net | 1,072,459 |
Total unrealized (losses) gains | (1,051,659) | 256,000
Purchases of securities/changes to securities/non-cash conversions |  | 31,950
Repayments and sales of securities | (1,316,459) |
Applied Image, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities | (29,170) |
Loan investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ending balance, of Level 3 Assets | 3,154,587 | 15,037,873
Total unrealized (losses) gains |  | (875,000)
Purchases of securities/changes to securities/non-cash conversions | 32,964 | 533,454
Repayments and sales of securities | 0 | (5,572,902)
Ending balance, of Level 3 Assets | 3,187,551 | 9,123,425
Loan investments | Swanson |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 32,964 |
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 |  | 158,454
Loan investments | ITA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | (875,000)
Purchases of securities/changes to securities/non-cash conversions |  | 375,000
Loan investments | Mattison |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities |  | (5,572,902)
Debt investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ending balance, of Level 3 Assets | 35,302,967 | 38,043,721
Total unrealized (losses) gains | (1,426,457) |
Purchases of securities/changes to securities/non-cash conversions | 4,292,890 | 504,153
Repayments and sales of securities | (29,170) | (2,796,974)
Ending balance, of Level 3 Assets | 38,140,230 | 35,750,900
Debt investments | Autotality (formerly Filterworks Acquisition USA, LLC) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (1,023,457) |
Purchases of securities/changes to securities/non-cash conversions | 123,886 | 58,573
Debt investments | Bauer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 600 |
Debt investments | BlackJet |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 5,642 |
Debt investments | AME Holdco, LLC |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 3,000,000 |
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 | 400,000 | 212,770
Debt investments | Caitec |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 25,292 |
Debt investments | FCM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 13,521 | 12,222
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 | 3,637 | 3,601
Debt investments | Hilton Displays |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities |  | (1,071,824)
Debt investments | Highland |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 33,058 | 31,751
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 | 6,330 | 6,266
Debt investments | MRES |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (403,000) |
Purchases of securities/changes to securities/non-cash conversions | 680,924 | 124,575
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 |  | 22,445
Repayments and sales of securities |  | (1,725,150)
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 |  | 31,950
Debt investments | Applied Image, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Repayments and sales of securities | (29,170) |
Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ending balance, of Level 3 Assets | 10,022,942 | 17,736,447
Total realized gains, net | $ 1,075,571 | $ 925,332
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Gain (Loss), Investment and Derivative, Operating, before Tax | Realized Gain (Loss), Investment and Derivative, Operating, before Tax
Total unrealized (losses) gains | $ (613,659) | $ (423,384)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax | Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Purchases of securities/changes to securities/non-cash conversions | $ 1,050,000 |
Repayments and sales of securities | (1,319,571) | $ (955,357)
Ending balance, of Level 3 Assets | 10,215,283 | 17,283,038
Equity investments | Bauer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | 288,000 |
Equity investments | BlackJet |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | (250,000) |
Equity investments | AME Holdco, LLC |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 1,000,000 |
Equity investments | FSS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | (247,619)
Equity investments | Caitec |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases of securities/changes to securities/non-cash conversions | 50,000 |
Equity investments | Carolina Skiff |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net | 3,112 |
Repayments and sales of securities | (3,112) |
Equity investments | GoNoodle |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | (25)
Equity investments | Highland |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains | 400,000 |
Equity investments | EFINEA |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total unrealized (losses) gains |  | 288,235
Equity investments | Microcision |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | 55,357
Repayments and sales of securities |  | (55,357)
Equity investments | Pressure Pro |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net |  | 870,000
Total unrealized (losses) gains |  | (720,000)
Repayments and sales of securities |  | (900,000)
Equity investments | Seybert |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total realized gains, net | 1,072,459 |
Total unrealized (losses) gains | (1,051,659) | $ 256,000
Repayments and sales of securities | $ (1,316,459) |

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