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