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Investments - Schedule of Transactions with Affiliated Investments and Controlled Investments (Details) - USD ($) | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Total Affiliated Investments [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | $ 14,750,785 | $ 37,289,617
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 8,289 | (25,481,801)
Transfers In/(Out) of Controlled | [1],[2] |  | (196,411)
Unrealized Gain/(Loss) | [1],[2] | (981,553) | 4,713,918
Realized Gain/(Loss) | [1],[2] |  | (1,991,456)
Fair value as of ending | [1],[2] | 13,777,521 | 14,333,867
Earned Income | [1],[2] | 254,231 | 732,176
Total Controlled Investments [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 70,931,647 | 63,640,043
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 53,537,545 | 8,355,592
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (1,807,602) | 1,311,890
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 122,661,590 | 73,307,525
Earned Income | [1],[2] | 4,194,951 | 3,082,492
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 751,207 | 875,749
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (302,288) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 448,919 | 875,749
Earned Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Super Priority DDTL [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 1,647,776 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (663,070) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 984,706 |
Earned Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 1,459,249
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (648,417)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 810,832
Earned Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Super Priority DDTL [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 1,920,960
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 1,920,960
Earned Income | [1],[2] |  |
FST Holdings Parent, LLC [Member] | Total Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 12,351,802 | 10,000,003
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 8,289 |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (16,195) | 726,323
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 12,343,896 | 10,726,326
Earned Income | [1],[2] | 254,231 |
ECC Capital Corp. [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 4,872,000 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | 159,600 |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 5,031,600 |
Earned Income | [1],[2] |  |
ECC Capital Corp. [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 7,422,012 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 7,422,012 |
Earned Income | [1],[2] | 391,510 |
FlexFIN, LLC [Member] | Total Controlled Investments [Member] | Equity Interest [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 36,683,045 | 38,870,711
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 92,290 | (4,141,486)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 36,775,335 | 34,729,225
Earned Income | [1],[2] | 2,979,966 | 2,233,395
NSG Captive, Inc [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 101,000 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 49,145,255 | 100,000
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (849,113) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 48,397,142 | 100,000
Earned Income | [1],[2] |  |
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 5,500,000 | 7,214,856
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 4,300,000 | (1,705,081)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (9,775)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 9,800,000 | 5,500,000
Earned Income | [1],[2] | 294,649 | 580,266
NVTN LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 11,900,000
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (11,900,000)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 16,353,590 | 5,037,547
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (1,118,089) | 12,488,543
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 15,235,501 | 17,526,090
Earned Income | [1],[2] | $ 528,826 |
1888 Industrial Services, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan C [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 751,479
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (1,096,561)
Transfers In/(Out) of Controlled | [1],[2] |  | (196,411)
Unrealized Gain/(Loss) | [1],[2] |  | 439,778
Realized Gain/(Loss) | [1],[2] |  | 101,715
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  | 37,645
1888 Industrial Services, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan A [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 9,473,068
Realized Gain/(Loss) | [1],[2] |  | (9,473,068)
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
1888 Industrial Services, LLC [Member] | Total Affiliated Investments [Member] | Revolving Credit Facility [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 4,632,177
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (5,112,074)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  | 479,897
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  | 158,674
Maritime Wireless Holdings LLC [Member] | Total Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 10,150,000
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (11,900,000)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (5,150,000)
Realized Gain/(Loss) | [1],[2] |  | 6,900,000
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Maritime Wireless Holdings LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 7,500,000
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (7,373,166)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (126,834)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  | 535,857
Kemmerer Operations, LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 9,133,052
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 2,300,000
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 733,122
Fair value as of ending | [1],[2] |  | 12,166,174
Earned Income | [1],[2] |  |
Kemmerer Operations, LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 3,383,877
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (97,841)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 3,286,036
Earned Income | [1],[2] |  | $ 268,831
[1] | Securities with a zero value at the beginning and end of the period, and those that had no transaction activity were excluded from the roll forward.
[2] | The par amount and additional detail are shown in the Consolidated Schedules of Investments.

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