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Investments (Details) - Schedule of Transactions with Affiliated Investments and Controlled Investments - USD ($) | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Total Affiliated Investments [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | $ 37,289,617 |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] | (25,481,801) |
Transfers In/(Out) of Affiliates | [1],[2] | (196,411) |
Unrealized Gain/(Loss) | [1],[2] | 4,787,878 |
Realized Gain/(Loss) | [1],[2] | (1,991,456) |
Fair value as of ending | [1],[2] | 14,407,827 |
Earned Income | [1],[2] | 742,858 |
Total Controlled Investments [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 63,640,043 |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] | 16,208,145 |
Transfers In/(Out) of Affiliates | [1],[2] | (9,153,693) |
Unrealized Gain/(Loss) | [1],[2] | (8,655,048) |
Realized Gain/(Loss) | [1],[2] | 8,542,831 |
Fair value as of ending | [1],[2] | 70,582,278 |
Earned Income | [1],[2] | 5,050,037 |
Total Affiliated Investments [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | $ 58,026,182
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | (9,808,988)
Transfers In/(Out) of Affiliates | [1],[2] |  | 3,341,227
Unrealized Gain/(Loss) | [1],[2] |  | 7,533,196
Realized Gain/(Loss) | [1],[2] |  | 24,131
Fair value as of ending | [1],[2] |  | 59,115,748
Earned Income | [1],[2] |  | 3,299,827
1888 Industrial Services, LLC [Member] | 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 Affiliates | [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] | 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 Affiliates | [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] | 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 Affiliates | [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 |
1888 Industrial Services, LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 763,798
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 763,798
Earned Income | [1],[2] |  | 25,765
1888 Industrial Services, LLC [Member] | Affiliated Investments [Member] | Revolving Credit Facility One [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 4,151,562
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 215,622
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 264,993
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 4,632,177
Earned Income | [1],[2] |  | 336,502
Black Angus Steakhouses, LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 875,749 |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [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] |  |
Black Angus Steakhouses, LLC [Member] | 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 Affiliates | [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] |  |
Black Angus Steakhouses, LLC [Member] | 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 Affiliates | [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] |  |
Black Angus Steakhouses, LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 758,929
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 9,915
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 75,893
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 844,737
Earned Income | [1],[2] |  | 94,376
Black Angus Steakhouses, LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 1,547,918
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (100,951)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 1,446,967
Earned Income | [1],[2] |  |
Black Angus Steakhouses, LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Super Priority DDTL [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 1,500,000
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 19,796
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 166,667
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 1,686,463
Earned Income | [1],[2] |  | 224,616
FST Holdings Parent, LLC [Member] | Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 10,000,003 |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [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] |  |
FST Holdings Parent, LLC [Member] | Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 8,000,000
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 8,000,000
Earned Income | [1],[2] |  |
Maritime Wireless Holdings LLC [Member] | 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 Affiliates | [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] | 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 Affiliates | [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 |
Maritime Wireless Holdings LLC [Member] | 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] |  | (1,500,703)
Transfers In/(Out) of Affiliates | [1],[2] |  | 4,900,000
Unrealized Gain/(Loss) | [1],[2] |  | 61,742
Realized Gain/(Loss) | [1],[2] |  | 30,211
Fair value as of ending | [1],[2] |  | 3,491,250
Earned Income | [1],[2] |  | 163,403
Maritime Wireless Holdings LLC [Member] | Affiliated Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | (1,055)
Transfers In/(Out) of Affiliates | [1],[2] |  | 7,350,000
Unrealized Gain/(Loss) | [1],[2] |  | 132,305
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 7,481,250
Earned Income | [1],[2] |  | 267,124
Maritime Wireless Holdings LLC [Member] | Affiliated Investments [Member] | Convertible Promissory Note [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  | 5,000,000
Unrealized Gain/(Loss) | [1],[2] |  | 1,925,000
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 6,925,000
Earned Income | [1],[2] |  |
ECC Capital Corp. [Member] | Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] | 4,251,084 |
Transfers In/(Out) of Affiliates | [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] |  |
ECC Capital Corp. [Member] | Affiliated Investments [Member] | Senior Secured Promissory Note [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] | 10,422,012 |
Transfers In/(Out) of Affiliates | [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] | Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
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 Affiliates | [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] | Affiliated Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 2,378,510
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  | (2,378,510)
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Kemmerer Operations, LLC [Member] | Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 694,702
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  | (962,717)
Unrealized Gain/(Loss) | [1],[2] |  | 268,015
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
Kemmerer Operations, LLC [Member] | 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] | (10,378,988) |
Transfers In/(Out) of Affiliates | [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] |  |
Kemmerer Operations, LLC [Member] | 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] | 5,769,816 |
Transfers In/(Out) of Affiliates | [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] | Controlled Investments [Member] | Senior Secured First Lien Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 2,329,641
Transfers In/(Out) of Affiliates | [1],[2] |  | 2,378,510
Unrealized Gain/(Loss) | [1],[2] |  | (1)
Realized Gain/(Loss) | [1],[2] |  | 24,131
Fair value as of ending | [1],[2] |  | 4,732,281
Earned Income | [1],[2] |  | 245,738
Kemmerer Operations, LLC [Member] | Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 873,440
Transfers In/(Out) of Affiliates | [1],[2] |  | 962,717
Unrealized Gain/(Loss) | [1],[2] |  | 7,319,045
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 9,155,202
Earned Income | [1],[2] |  |
NSG Captive, Inc. [Member] | Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] | 100,000 |
Transfers In/(Out) of Affiliates | [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] | 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 Affiliates | [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] | Controlled Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan One [Member] |  |  |
Affiliated Investments |  |  |
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 Affiliates | [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] | Controlled Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] | 5,037,547 |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [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] | Controlled Investments [Member] | Senior Secured First Lien Delayed Draw Term Loan [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 7,192,927
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 14,620
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 7,207,547
Earned Income | [1],[2] |  | 416,974
NVTN LLC [Member] | Controlled Investments [Member] | Senior Secured First Lien Term Loan B [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 3,697,109
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | 199,532
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 3,896,641
Earned Income | [1],[2] |  |
NVTN LLC [Member] | Controlled Investments [Member] | Senior Secured First Lien Term Loan C [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  |
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  |
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  |
Earned Income | [1],[2] |  |
US Multifamily, LLC [Member] | Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 1,282,571
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | (972,483)
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  | (244,952)
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 65,136
Earned Income | [1],[2] |  |
US Multifamily, LLC [Member] | Total Affiliated Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 12,314,192
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | 5,771,092
Transfers In/(Out) of Affiliates | [1],[2] |  | 13,908,773
Unrealized Gain/(Loss) | [1],[2] |  | 3,312,510
Realized Gain/(Loss) | [1],[2] |  | 30,211
Fair value as of ending | [1],[2] |  | 35,336,778
Earned Income | [1],[2] |  | 1,111,786
FlexFIN, LLC [Member] | Controlled Investments [Member] | Equity [Member] |  |  |
Affiliated Investments |  |  |
Fair value as of beginning | [1],[2] |  | 47,136,146
Purchases/(Sales) of or Advances/(Distributions) | [1],[2] |  | (13,012,069)
Transfers In/(Out) of Affiliates | [1],[2] |  |
Unrealized Gain/(Loss) | [1],[2] |  |
Realized Gain/(Loss) | [1],[2] |  |
Fair value as of ending | [1],[2] |  | 34,124,077
Earned Income | [1],[2] |  | $ 2,637,115
[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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