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Investments - Schedule of Transactions with Affiliated Investments and Controlled Investments (Details) - USD ($) | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Total Affiliated Investments [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | $ 14,750,785 | $ 37,289,617
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | (235,600) | (25,481,801)
Transfers In/(Out) of Controlled | [1],[2] |  | (196,411)
Unrealized Gain/(Loss) | [1],[2] | 7,397,502 | 4,787,878
Realized Gain/(Loss) | [1],[2] | (10,320,353) | (1,991,456)
Fair value as of ending | [1],[2] | 11,592,334 | 14,407,827
Earned Income | [1],[2] | 254,231 | 742,858
Fee/Other Income | [1],[2] |  |
Total Controlled Investments [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 70,931,647 | 63,640,043
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 53,416,033 | 16,208,145
Transfers In/(Out) of Controlled | [1],[2] |  | (9,153,693)
Unrealized Gain/(Loss) | [1],[2] | (892,789) | (8,655,048)
Realized Gain/(Loss) | [1],[2] |  | 8,542,831
Fair value as of ending | [1],[2] | 123,454,891 | 70,582,278
Earned Income | [1],[2] | 5,419,936 | 5,050,037
Fee/Other Income | [1],[2] | 552,882 |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 751,207 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | (243,889) |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | 124,542 |
Realized Gain/(Loss) | [1],[2] | (631,860) |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Fee/Other Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] | 7,767,533 |
Realized Gain/(Loss) | [1],[2] | (7,767,533) |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Fee/Other Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Super Priority DDTL [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] | 273,184 |
Realized Gain/(Loss) | [1],[2] | (1,920,960) |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Fee/Other Income | [1],[2] |  |
FST Holdings Parent, LLC [Member] | Total Affiliated Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 12,351,802 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 8,289 |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (767,757) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 11,592,334 |
Earned Income | [1],[2] | 254,231 |
Fee/Other Income | [1],[2] |  |
ECC Capital Corp [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] | 538,943 |
Fee/Other Income | [1],[2] |  |
ECC Capital Corp [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] | 1,596,000 |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 6,468,000 |
Earned Income | [1],[2] |  |
Fee/Other Income | [1],[2] | 161,611 |
ECC Capital Corp [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 4,251,084
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (1,311,084)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 2,940,000
Earned Income | [1],[2] |  |
FlexFIN, LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 36,683,045 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | (438,043) |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 36,245,002 |
Earned Income | [1],[2] | 3,597,022 |
Fee/Other Income | [1],[2] |  |
NSG Captive, Inc. [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 101,000 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 49,154,076 |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (826,575) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 48,428,501 |
Earned Income | [1],[2] |  |
Fee/Other Income | [1],[2] | 391,271 |
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 5,500,000 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] | 4,700,000 |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 10,200,000 |
Earned Income | [1],[2] | 575,494 |
Fee/Other Income | [1],[2] |  |
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] | 16,353,590 |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] | (1,662,214) |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] | 14,691,376 |
Earned Income | [1],[2] | 708,477 |
Fee/Other Income | [1],[2] |  |
1888 Industrial Services, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan C [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  | 48,327
1888 Industrial Services, LLC [Member] | Total Affiliated Investments [Member] | Senior Secured First Lien Term Loan A [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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
Total Affiliated Investments [Member] | Black Angus Steakhouses, LLC [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 875,749
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] |  | 875,749
Earned Income | [1],[2] |  |
Total Affiliated Investments [Member] | Black Angus Steakhouses, LLC [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  | (1,008,883)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 450,366
Earned Income | [1],[2] |  |
Total Affiliated Investments [Member] | Black Angus Steakhouses, LLC [Member] | Senior Secured First Lien Super Priority DDTL [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 10,000,003
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 1,160,749
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 11,160,752
Earned Income | [1],[2] |  |
Maritime Wireless Holdings LLC [Member] | Total Affiliated Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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
Total Controlled Investments [Member] | ECC Capital Corp [Member] | Senior Secured Promissory Note [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 10,422,012
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 10,422,012
Earned Income | [1],[2] |  | 482,173
FlexFIN, LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 38,870,711
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (4,162,202)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 34,708,509
Earned Income | [1],[2] |  | 3,216,298
Kemmerer Operations, LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 3,383,877
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 5,769,816
Transfers In/(Out) of Controlled | [1],[2] |  | (9,153,693)
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  | 268,831
Kemmerer Operations, LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 9,133,052
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (10,378,988)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (7,296,895)
Realized Gain/(Loss) | [1],[2] |  | 8,542,831
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
NSG Captive, Inc. [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | 100,000
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 100,000
Earned Income | [1],[2] |  |
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 7,214,856
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  | (1,693,577)
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (21,279)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 5,500,000
Earned Income | [1],[2] |  | 868,449
NVTN LLC [Member] | Total Controlled Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
Fair value as of beginning | [1],[2] |  | 5,037,547
Purchases/(Sales) of or Advances/ (Distributions) | [1],[2] |  |
Transfers In/(Out) of Controlled | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 11,874,210
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 16,911,757
Earned Income | [1],[2] |  | 214,286
NVTN LLC [Member] | Total Controlled Investments [Member] | Equity [Member] |  |  |
Schedule of Transactions with Affiliated Investments and Controlled Investments [Line Items] |  |  |
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] |  |
[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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