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Investments - Schedule of Transactions with Affiliated Investments and Controlled Investments (Details) - USD ($)
 9 Months Ended
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.